File updated 12/1/2003 12:59:16 PM
IMPROVE Flag List: 
Flag            Implementation  Measurement     Description
AA              3/1/1988        aerosol         ORGANIC ARTIFACT CORRECTED
AP              3/1/1988        aerosol         POSSIBLE ORGANIC ARTIFACT
DE              3/1/1988        aerosol         Derived value
MI              3/1/1988        aerosol         Missing routine sampling day.  No data available, cause unspecified.
MN              3/1/1988        aerosol         NO ANALYSIS AVAILABLE FOR THIS SPECIES
NM              3/1/1988        aerosol         NORMAL
QD              3/1/1988        aerosol         QUESTIONABLE DATA
QU              3/1/1988        aerosol         QUESTIONABLE;UNDETERMINED
BI              3/1/2000        aerosol         Incorrect installation of sample cartridge during weekly change
CG              3/1/2000        aerosol         Clogged Filter, generally associated with fire impact.  The final flow rate is less than one-half of the initial flow rate.
CL              3/1/2000        aerosol         Clogged Filter, generally associated with fire impact.  The final flow rate is less than one-half of the initial flow rate.
EP              3/1/2000        aerosol         Equipment Problem
LF              3/1/2000        aerosol         The flow is greater than 10% higher or lower than the nominal flow rate.  This effects the cut point of the particle but the concentrations are correct.
MU              3/1/2000        aerosol         Missing Undetermined (Valid module flag but NULL obs_value)
NA              3/1/2000        aerosol         Not Applicable.  This is used for missing modules with non-protocol samplers with less than four modules.
NS              3/1/2000        aerosol         Operator did not install the samples or installed them too late to acquire a valid time.  All filters involved.
OL              3/1/2000        aerosol         Off Line.  In some cases, this is used when the sampler is inoperable due to hurricane or fire.  For year 2000, this is used for the period after the Version 1 sampler is removed and before the Version 2 samples begins operation.
PO              3/1/2000        aerosol         Power Outage.  All filters involved.
RF              3/1/2000        aerosol         The flow is greater than 20% higher or lower than the nominal flow rate.  This affects the cut point of the particle but the concentrations are correct.
UN              3/1/2000        aerosol         The concentrations failed the data validation for unknown reasons.
XX              3/1/2000        aerosol         The filter is damaged.