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Air Quality in Indiana

One of the many responsibilities of the Indiana Department of Environmental Management (IDEM) is to protect the quality of Indiana’s air. This responsibility couldn’t be more important because air quality affects us every minute of every day. Good air quality helps us live our lives with vitality and energy. Poor air quality can cause harm to our health and the environment.

A national approach to air pollution control is established in the Clean Air Act (CAA), with National Ambient Air Quality Standards (NAAQS) as the foundation for reducing six common (criteria) pollutants including carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and sulfur dioxide. The CAA also contains key provisions for nationwide air permitting programs, controlling air toxics, addressing acid rain, protecting the ozone layer, addressing regional haze , air quality monitoring, and state implementation plans (SIPs). United States Environmental Protection Agency (U.S. EPA) and the states have authority and certain responsibilities for implementing the CAA. IDEM’s Office of Air Quality (OAQ) implements CAA requirements in Indiana.

There are many ways to stay informed about the quality of the air you breathe. Air quality maps provide near-real time data on pollutants and meteorological parameters monitored across Indiana. SmogWatch daily forecasts provide updates on air quality for fine particle pollution and ground-level ozone, the most widespread criteria pollutants. Seasonal and annual data summary reports discuss Indiana’s current status, history, and long-term trends for fine particles, ground-level ozone, and sulfur dioxide. Quick View Current Monitoring Data Summaries contain detailed data tables on each of the criteria pollutants. Air toxics studies and reports contain analyses of data from active and historical monitoring sites.

OAQ’s Featured Topics page highlights information about regulations and issues with wide public interest.