Note: EPA no longer updates this information, but it may be useful as a reference or resource.
Please see www.epa.gov/airtrends for the latest information on Air Quality Trends.
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Chapter 1 - Executive Summary (37 KB)
Chapter 2 - Air Quality Trends (1213 KB)
Chapter 4 - Air Toxics (71 KB)
Chapter 5 - Nonattainment Areas (112 KB)
Chapter 6 - Metropolitan Area Trends (162 KB)
Appendix A - Data Tables (623 KB)
Appendix B - Methodology (378 KB)