Spatial and Seasonal Patterns and Temporal Variability of Haze and its Constituents in the United States Report VI: June 2023
IMPROVE Report
- Entire Document (PDF) Chapters only (no appendices)
- Cover-dedication-title-TOC
- Executive Summary
- Chapter 1 – Interagency Monitoring of Protected Visual Environments (IMPROVE) Network: Configuration and Measurements
- Chapter 2 – Spatial Patterns of Speciated PM2.5 Aerosol Mass Concentrations
- Chapter 3 – Seasonal Distributions of PM2.5 Aerosol Mass
- Chapter 4 – Reconstructed Aerosol Light Extinction Coefficients
- Chapter 5 – Seasonal Distribution of Reconstructed Aerosol Light Extinction Coefficients
- Chapter 6 – Trends in IMPROVE Speciated Aerosol Concentrations
- Chapter 7 – Trends in IMPROVE Reconstructed Light Extinction Coefficients
- Chapter 8 – IMPROVE Bibliography 2010 to Present
- Appendix 1.1 –A New Cost-Effective Analytical Method for IMPROVE: Nondestructive Infrared Analysis of PTFE Filters to Measure Organic, Elemental, and Total Carbon, Inorganic Ions, Soil Elements, Organic Matter (OM), and Organic Functional Groups
- Appendix 1.2 – Documentation of Changes in Analytical Methods and Data Processing Due to the Chemical Speciation Network (CSN) Contractor Changes in 2015
- Appendix 2.1– Monthly Varying Organic Carbon to Mass Ratio
- Appendix 2.2-2.3 – 2016–2019 IMPROVE and CSN Annual Mean Mass Concentrations and Mass Fractions
- Appendix 3.1-3.2 – 2016–2019 IMPROVE and CSN Regional, Monthly Mean Mass Concentrations and Mass Fractions
- Appendix 4.1-4.2 – IMPROVE and CSN Monthly Humidification Factors (f(RH))
- Appendix 4.3-4.4 – IMPROVE and CSN Annual Mean Light Extinction Coefficients and Extinction Fractions
- Appendix 5.1-5.2 – 2016–2019 IMPROVE and CSN Regional, Monthly Mean Light Extinction Coefficients and Fractions
- Appendix 6.1-6.3 – IMPROVE Short- and Long-term Annual Mean and Percentile Mass Trends
- Appendix 7.1-7.3 – IMPROVE Short- and Long-term Annual Mean and Percentile Light Extinction Coefficient Trends
- Appendix 8 – Regional Haze Rule Metrics
Data (excel files)
- App2.2_2.3_table_annualmass_fraction_230214.xls
- App3.1_3.2_table_regmass_fraction_230215.xls
- App4.1_IMP_fRH_230215.csv
- App4.2_CSN_fRH_230215.csv
- App4.3_4.4_table_annualbext_fraction_230216.xls
- App5.1_5.2_table_regionalbext_fraction_230214.xls
- App6.1_massanntrend_230717.xls
- App6.2_massSTperc_230220.xls
- App6.3_massLTperc_230220.xls
- App7.1_bextanntrend_230220.xls
- App7.2_bextSTperctrend_230220.xls
- App7.3_bextLTperctrend_230220.xls

