This booklet explains EPA's Air Quality Index (AQI) and the health effects of major air pollutants.

Air Quality Index Reporting; Final Rule This Federal Register notice provides EPA's rationale for the 1999 revisions to the Air Quality Index used by States for daily reporting to the general public in accordance with section 319 of the Clean Air Act.

08/4/1999

This guide provides you with information about ways to protect your health when nitrogen dioxide levels reach the unhealthy range, and ways you can help reduce nitrogen dioxide air pollution.

02/2011

This guide provides you with information about ways to protect your health when ozone levels reach the unhealthy range, and ways you can help reduce ozone air pollution.

This guide provides you with information about ways to protect your health when particle pollution levels reach the unhealthy range, and ways you can help reduce particle air pollution.

This guidance is designed to aid local agencies in reporting the air quality using the AQI as required in the Code of Federal Regulations (CFR). For more information contact David Mintz at (mintz.david@epa.gov).
Updated May 2024

This brochure explains how to use the Air Quality Index, and how high levels of ozone and particle matter can affect your health. Learn where this pollution comes from and what you can do to protect yourself when air quality is poor.

02/2007

This guidance can help protect the health of all children, including teenagers, who are more sensitive than adults to air pollution.

08/2014