{"id":66,"date":"2016-03-22T17:27:08","date_gmt":"2016-03-22T17:27:08","guid":{"rendered":"http:\/\/newvista.cira.colostate.edu\/Improve\/?page_id=66"},"modified":"2025-12-19T00:05:45","modified_gmt":"2025-12-19T00:05:45","slug":"data-advisories","status":"publish","type":"page","link":"https:\/\/vista.cira.colostate.edu\/Improve\/data-advisories\/","title":{"rendered":"Data Advisories"},"content":{"rendered":"\n<figure class=\"wp-block-table\"><table><tbody><tr><td>\n<p style=\"text-align: left;\" align=\"center\">This is an IMPROVE data user community supported page meant to document interesting findings from the IMPROVE database including data anomalies, potential problems, and new uses for the IMPROVE data.&nbsp; These advisories are not meant to be comprehensive or complete.&nbsp; In addition, unless explicitly stated the data advisories are not necessarily endorsed by the IMPROVE steering committee, National Park Service, CIRA or others.<\/p>\n<table id=\"table1\" border=\"1\" width=\"1086\">\n<tbody>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0047\/2025-10-22 IMPROVE XRF Protocol Change.pdf\" target=\"_blank\" rel=\"noopener\">Change in the analytical protocol for XRF Analysis<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: J. Giacomo and N. Hyslop<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 10\/2025<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0047<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire Network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;4\/2024-present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/Manganese, Iron, Nickel, Copper, Zinc, Arsenic, Selenium, Bromine, Rubidium, Strontium, Lead<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0046\/da0046_Invalid_P_Measurements.pdf\" target=\"_blank\" rel=\"noopener\">Phosphorus (P) underreported by one XRF instrument<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: J. Giacomo and N. Hyslop<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 02\/2025<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0046<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All sites but not all samples<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;1\/2011-4\/2020<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/Phosphorus<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0045\/da0045_2025_Overestimated_Al_due_to_Cl_interference.pdf\" target=\"_blank\" rel=\"noopener\">Overestimated Al due to Cl interference<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: J. Giacomo and N. Hyslop<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 01\/2025<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0045<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Coastal sites and sites with high chlorine concentrations<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;4\/3\/2020-6\/30\/2021<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/Aluminum<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0044\/da0044_UniversalFlowRateCalibrationConstants.pdf\" target=\"_blank\" rel=\"noopener\">Universal calibration constants for flow rate calculation<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: C. Wallis<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 09\/2019<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0044<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All, following installation of Version 4 controllers<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;2018-present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: All<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0043\/da0043_XRFprotocolChange2019.pdf\" target=\"_blank\" rel=\"noopener\">Change in analytical protocol for XRF analysis<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: K. Trzepla<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 06\/2019<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0043<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;10\/2018-present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/All elements<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0042\/da0042_FlowrateTransferStandardCalibrationProtocol.pdf\" target=\"_blank\" rel=\"noopener\">Method change for calibrating flow rate transfer standards<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>:&nbsp;C. Wallis<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 05\/2019<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0042<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;1\/2015-present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species:&nbsp;All<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0041\/da0041_HIPSmodifications.pdf\" target=\"_blank\" rel=\"noopener\">Changes to HIPS System<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: K.Trzepla &amp;&nbsp;J. Giacomo<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 04\/2019<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0041<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;1\/2017-present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species:&nbsp;A\/Fabs<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0040\/da0040_TOR_integration.pdf\" target=\"_blank\" rel=\"noopener\">Updated data for Carbon<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: B Schichtel<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 04\/2019<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0040<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;1\/2016-2\/2017<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: C\/ EC, OC, TC, Carbon fractions<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0039\/da0039_ChlorideOverCorrection.pdf\" target=\"_blank\" rel=\"noopener\">Correction of chloride concentrations for filter blank levels<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: X. Zhang<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 3\/2019<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0039<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;2007-2011<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: B\/ Cl-<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0038\/da0038_V_advisory.pdf\" target=\"_blank\" rel=\"noopener\">Calibration bias in reported vanadium concentrations<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: K. Trzepla<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 02\/2018<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0038<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;1\/2011-10\/2017<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ V<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0037\/da0037_Na_matrix.pdf\" target=\"_blank\" rel=\"noopener\">Over-reporting of sodium in salt-rich samples<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W.H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 06\/2017<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0037<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;Before 1\/1\/2011<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ Na<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0036\/da0036_chloride_loss.pdf\" target=\"_blank\" rel=\"noopener\">Negative chloride concentrations at salt-poor sites<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W.H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 03\/2017<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0036<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp;2000-2003<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: B\/ Cl <sup>&#8211;<\/sup><\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0035\/da0035_IncreasedRH.pdf\" target=\"_blank\" rel=\"noopener\">Increased variation of humidity in the weighing laboratory<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W.H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 09\/2016<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0035<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 2011 and later<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ MF D\/ MT<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0034\/da0034_update-mask-Fabs.pdf\" target=\"_blank\" rel=\"noopener\">Bias between masked and unmasked light absorption measurements<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W.H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 10\/2015<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0034<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> Before 2008<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ Fabs<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0033\/da0033_Fabs.pdf\" target=\"_blank\" rel=\"noopener\">Changed reporting of light absorption<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W.H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 09\/2015<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0033<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> All sample years<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ Fabs<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0032\/da0032_OC_artifact.pdf\" target=\"_blank\" rel=\"noopener\">Change to artifact correction method for OC carbon fractions<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: A. M. Dillner<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 09\/2015<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0032<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 1\/1\/2005 &#8211; current<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: C\/OC<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0031\/da0031_2010to2014Redelivery.pdf\" target=\"_blank\" rel=\"noopener\">Changes in redelivery of 1\/2005 through 5\/2014 data<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: Xiaoya Cheng<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 09\/2015<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0031<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 1\/1\/2005 &#8211; 5\/31\/2014<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: All<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0030\/da0030_CORI_Zn.pdf\" target=\"_blank\" rel=\"noopener\">Temporary contamination of Columbia River A-module samples<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White et al.,<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 06\/2014<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0030<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>CORI<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 11\/5\/2011 &#8211; 7\/14\/2012<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ Zn, MF<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0029\/da0029_NOAB_CrNi.pdf\" target=\"_blank\" rel=\"noopener\">Contamination associated with new sampler shed<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White et al.,<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 06\/2014<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0029<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>NOAB<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 1\/1\/2008 &#8211; 8\/16\/2012<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ Cr, Ni<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0028\/da0028_DA_mask_Fabs.pdf\" target=\"_blank\" rel=\"noopener\">Bias between masked and unmasked light absorption measurements<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 03\/2010<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0028<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> Before 2008<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ fabs<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0027\/da0027_DA_C00_Fabs_comp.pdf\" target=\"_blank\" rel=\"noopener\">Suspect light-absorption data from three months in 2000<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 03\/2010<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0027<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 9\/1\/2000 &#8211; 11\/30\/2000<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ fabs<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0026\/da0026_DA_PIXE_Mo.pdf\" target=\"_blank\" rel=\"noopener\">Marginal detection of heavy elements by PIXE analysis<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 03\/2010<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0026<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> Before 6\/1\/1992<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ Pb, Sr, Se, Rb<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0025\/da0025_DA_arcane_flags.pdf\" target=\"_blank\" rel=\"noopener\">Arcane flagging of early hydrogen and fine mass data<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 03\/2010<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0025<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 9\/1\/1990 \u2013 2\/26\/1992<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ MF, H<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0024\/da0024_HDA_Chloride.pdf\" target=\"_blank\" rel=\"noopener\">Under-correction of chloride concentrations for filter blank levels &#8211; historical Advisory:&nbsp; Applies to downloads before 11\/23\/2009<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 08\/2009<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0024<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 2005 &#8211; 2008<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: B\/ Cl<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0023\/da0023_DA_SSO4_update.pdf\" target=\"_blank\" rel=\"noopener\">Inconstant bias in XRF sulfur &#8211; Advisory Update to da0012<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 05\/2009<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0023<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> All<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ S<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0022\/da0022_DA-smoke.pdf\" target=\"_blank\" rel=\"noopener\">Data losses during episodes of heavy smoke<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 01\/2009<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0022<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>All<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> All<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ MF, elements, fabs<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0021\/da0021_HDA_Fa_area.pdf\" target=\"_blank\" rel=\"noopener\">Mis-reporting of light-absorption on masked filters &#8211; Historical Advisory: Applies to downloads before 4\/17\/2009<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 09\/2008<i><br>Modified on<\/i>: 04\/2009<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0021<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>BRID1, DENA1, HALE1, HANC1, HAVO1, MEVE1, MORA1, NOAB1, NOCA1, OLYM1, PETE1, SIME1, SNPA1, TRCR1, TUXE1, VIIS1, WEMI1, WHIT1, WHPA1, WHPE1, WHRI1, ZICA1<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 2005 \u2013 2006<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ fabs<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0020\/da0020_HDA_collo_gaps.pdf\" target=\"_blank\" rel=\"noopener\">Invalid data for collocated (POC = 2) samples &#8211; Historical Advisory: Applies to downloads before 4\/17\/2009<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\">\n<p><i>On<\/i>: 09\/2008<\/p>\n<p><i>Modified on<\/i>: 04\/2009<\/p>\n<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0020<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>MEVE1, OLYM1, PMRF1, SAFO1, SAMA1, TRCR1<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> January \u2013 July, 2005<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ H, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0019\/da0019_masks.pdf\" target=\"_blank\" rel=\"noopener\">Bias between masked and unmasked elemental measurements<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 07\/2008<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0019<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> evident since 2002<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ S<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0018\/da0018_Ti.pdf\" target=\"_blank\" rel=\"noopener\">Positive interference in PIXE titanium determinations<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 03\/2008<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0018<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> Before 12\/1\/2001<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ Ti<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0017\/da0017_Na.pdf\" target=\"_blank\" rel=\"noopener\">Changes in sodium data quality<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 11\/2007<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0017<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 12\/1\/2001 \u2013 Present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ Na<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0016\/da0016_TOR2005.pdf\" target=\"_blank\" rel=\"noopener\">Shift in EC\/OC split with 1 January 2005 TOR hardware upgrade<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 10\/2007<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0016<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 1\/1\/2005 \u2013 Present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: C\/ EC, OC; OC1, OC2, OC3, OC4, OP, EC1, EC2, EC3<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0015\/da0015_NewFlowFlags.pdf\" target=\"_blank\" rel=\"noopener\">Change in definition of flowrate native flags<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: C. McDade<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 9\/2007<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0015<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 1\/1\/2005 \u2013 Present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A, B, C\/ All species<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0014\/da0014_Mo_drop.pdf\" target=\"_blank\" rel=\"noopener\">Shifts in Mo-anode XRF element calibration factors<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: R. Flocchini<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 9\/2007<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0014<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 9\/2005<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A\/ Ni, As, Se, Br, Rb, Pb<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0013\/da0013_TwoVacs.pdf\" target=\"_blank\" rel=\"noopener\">Introduction of a second copper-anode XRF system<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 2\/2007<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0013<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 2005 \u2013 Present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A<\/i>\/ <i>Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe<\/i><\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0012\/da0012_SSO4.pdf\" target=\"_blank\" rel=\"noopener\">Varying bias of XRF sulfur relative to IC sulfate<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 1\/2007<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0012<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 2003 \u2013 2004; maybe to earlier years<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A<\/i>\/ S<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0011\/da0011_S_Si.pdf\" target=\"_blank\" rel=\"noopener\">S interference in XRF determination of Si<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 12\/2006<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0011<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 2001 &#8211; Present<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A<\/i>\/ S,Si<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0010\/da0010_Almdl.pdf\" target=\"_blank\" rel=\"noopener\">Elemental concentrations of Al above the MDL can go undetected<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 11\/2006<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0010<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> entire record<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A<\/i>\/ Al<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0009\/da0009_S_reporting.pdf\" target=\"_blank\" rel=\"noopener\">Changed reporting of XRF sulfur<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 10\/2006<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0009<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 1\/1\/05 &#8211;<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: A<\/i>\/ S<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0008\/da0008_VIISB.pdf\" target=\"_blank\" rel=\"noopener\">B-module data from Virgin Islands<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 9\/2006<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0008<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>VIIS<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 6\/2001 &#8211; 5\/2003<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: B<\/i>\/ CHL, NO3, SO4<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0007\/da0007_Cu_HIVOL_update1.pdf\" target=\"_blank\" rel=\"noopener\">1-in-6-day Cu contamination from foreign samplers &#8211; Updated Advisory<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 9\/2006<i><br>Modified on<\/i>: 05\/2009<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0007<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>ATLA, BADL, BRMA, PMRF, ROMA, others<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 2002 &#8211;<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: <\/i>A\/ Cu<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0006\/da0006_PORE_Rumsey.pdf\"_blank\" rel=\"noopener\">High concentrations attributable to documented wildfire<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W. H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 9\/2006<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0006<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>PORE<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 10\/12\/04<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: <\/i>A\/ K;<br>C\/ OC EC<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0005\/da0005_blank_Zn_update1.pdf\" target=\"_blank\" rel=\"noopener\">Sporadic contamination by Zn &#8211; Updated Advisory<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>: W.&nbsp; H. White<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 9\/2006<br><i>Modified on<\/i>: 05\/2009<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0005<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 2004 known to be affected; earlier years may have been affected<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: <\/i>A\/ Zn<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0004\/da0004_SO4underReported.pdf\" target=\"_blank\" rel=\"noopener\">Significant Number of Under Reported Sulfate Ion Concentrations Prior to 3\/15\/1989<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>:<br>B.A. Schichtel<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 9\/2006<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0004<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites:<\/i> Sites in the Eastern United States<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i>&nbsp; 1992-1994<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: <\/i>B\/ SO4<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/vista.cira.colostate.edu\/improve\/Data\/QA_QC\/Advisory\/da0003\/da0003_IonLoss.htm\" target=\"_blank\" rel=\"noopener\">Significant Loss of Ion Concentrations in 1998 Due to Clogging of Module B Nylon Filters<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>:<br>B.A. Schichtel<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 9\/2006<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0003<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 6\/1996<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: <\/i>B\/ all<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0002\/da0002_WinterNO3.pdf\" target=\"_blank\" rel=\"noopener\">Diminished wintertime nitrate concentrations in late 1990s<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>:<br>C. McDade<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 3\/2007<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0002<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<\/i> 1998<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species:|<br>B<\/i>\/ SO4<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"37\"><a href=\"https:\/\/improvevisibility.org\/docs\/Data\/QA_QC\/Advisory\/da0001\/da0001_S_underestimation.pdf\" target=\"_blank\" rel=\"noopener\">Underestimation of Sulfur Concentrations During High Loadings and Humidity Conditions in the Eastern US<\/a><\/td>\n<td width=\"183\" height=\"37\"><i>Submitted by<\/i>:<br>B.A. Schichtel<\/td>\n<td align=\"center\" width=\"88\" height=\"37\"><i>On<\/i>: 11\/2003<\/td>\n<td align=\"center\" width=\"84\" height=\"37\"><i>Doc #<\/i>: da0001<\/td>\n<\/tr>\n<tr>\n<td width=\"703\" height=\"35\"><i>Sites: <\/i>Entire network<\/td>\n<td width=\"183\" height=\"35\"><i>Time Period:<br><\/i>&nbsp;1988 &#8211; 3\/15\/1989<\/td>\n<td colspan=\"2\" width=\"534\" height=\"35\"><i>Module\/Species: <\/i>A\/ S<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is an IMPROVE data user community supported page meant to document interesting findings from the IMPROVE database including data anomalies, potential problems, and new uses for the IMPROVE data.&nbsp; These advisories are not meant to be comprehensive or complete.&nbsp; In addition, unless explicitly stated the data advisories are not necessarily endorsed by the IMPROVE [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-66","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/vista.cira.colostate.edu\/Improve\/wp-json\/wp\/v2\/pages\/66","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vista.cira.colostate.edu\/Improve\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/vista.cira.colostate.edu\/Improve\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/vista.cira.colostate.edu\/Improve\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/vista.cira.colostate.edu\/Improve\/wp-json\/wp\/v2\/comments?post=66"}],"version-history":[{"count":56,"href":"https:\/\/vista.cira.colostate.edu\/Improve\/wp-json\/wp\/v2\/pages\/66\/revisions"}],"predecessor-version":[{"id":4763,"href":"https:\/\/vista.cira.colostate.edu\/Improve\/wp-json\/wp\/v2\/pages\/66\/revisions\/4763"}],"wp:attachment":[{"href":"https:\/\/vista.cira.colostate.edu\/Improve\/wp-json\/wp\/v2\/media?parent=66"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}