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Air Quality Trends

Indiana has a large network of outdoor monitors which measure for six common pollutants . These pollutants include carbon monoxide (CO), lead (Pb), nitrogen dioxide (NO2), ozone (O3), particulate matter (PM), and sulfur dioxide (SO2). This page provides reports on long-term trends.

IDEM divided the state into eight regions to provide readers with a more detailed breakdown of data where they live and work. The regions are not tied to policies or laws. Each report covers a period of 30 years. A region may not monitor for all six pollutants. All available data is included for each region.

Historical Air Quality Data

Historical Air Quality Data


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