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Read about the negative health effects of particle pollution — and find steps you can take to prevent them.

Learn how ground-level ozone can harm your health — and what you can do to protect yourself.

Air Pollutants

Find information on public health issues related to air quality, including asthma, heart disease and stroke, and more.

Air Quality and Emergencies

Air pollution is a mixture of natural and man-made substances in the air we breathe. It is typically separated into two categories: outdoor air pollution and indoor air pollution.

Ozone is a highly reactive form of oxygen.

From 2010 through 2012, the New York City Department of Health and Mental Hygiene engaged in multiple smoke-free-air activities in collaboration with community, institution, and government partners. These included implementing a law prohibiting smoking in all parks and beaches as well as working to increase compliance with existing Smoke-free Air Act provisions.

Philadelphia enacted its Clean Indoor Air Act (CIAA) nearly 2 years before the statewide CIAA. In this study, we assessed the economic impact of CIAAs on 4 types of food services and drinking places and addressed the predominant limitation of previous pre–post ban studies, namely the lack of control for confounders and changes in secular trends over time.

Secondhand Smoke Fact Sheets.