Air quality affects parks across the country. The maps below provide a nationwide look at park conditions and trends for air clarity (visibility), ozone, nitrogen deposition, sulfur deposition, and particulate matter. This information is based on monitoring data and NPS analysis methods. Conditions are relative to benchmarks and trends shown are 10-year trends.
Learn more about park-specific air quality by clicking on the maps below and by exploring our park conditions & trends page.
Last updated: January 11, 2021