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National Air Quality: Status and Trends of Key Air Pollutants

  • Interactive Report

    Explore air quality trends interactively with Our Nation's Air: Status and Trends Through 2021

There are links to two types of summaries provided on this page - air quality trends and air quality design values.

The air quality trends summaries are intended to reflect actual air quality and therefore include concentrations that may have been impacted by episodic events like wildfires and dust storms.  Air Quality Design Values are used to designate and classify nonattainment areas and intended to reflect air quality that is not impacted by exceptional events. Therefore if concentrations are shown to be impacted by an exceptional event they are not included in design value calculations. The EPA defines exceptional events as unusual or naturally-occurring events that affect air quality but are not reasonably controllable using techniques that tribal, state, or local air agencies may implement.

Air Quality Trends

  • Carbon Monoxide
  • Lead
  • Nitrogen Dioxide
  • Ozone
  • Particulate Matter (PM10)
  • Particulate Matter (PM2.5)
  • Sulfur Dioxide

Reports and Summaries

  • Interactive Report - Our Nation's Air: Status and Trends Through 2021
  • Previous Air Quality Trends Reports
  • AQI Trends - Ozone
  • AQI Trends - PM2.5
  • AQI Trends - Combined Ozone/PM2.5
  • Air Quality - National Summary
  • Air Quality - Cities and Counties
  • Air Quality Design Values
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on January 12, 2023
United States Environmental Protection Agency

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