Air Quality

-4 Days

In 2022, there were 24 moderately unhealthy days, four fewer than last year.

Favorable movement since the last available data

Benchmark: The overall number of days classified as a health risk and the severity of risks will be maintained through 2030.

Overview Fig. A


In 2022, there were 24 moderate air quality days, and 2 days rated unhealthy for sensitive groups. After declining in the 1980s and 1990s, air quality in Maine has improved substantially, and is better than most other states.

Maine’s air quality index is based on ozone levels, and reflects the number of days each year when the maximum ozone level recorded in the state reaches moderate or unhealthy levels. Maine’s air quality contributes to health and wellness, and makes it an attractive place to live, do business, and visit. Air quality is subject to factors both within and beyond our borders.

Fig. A

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Maine Air Quality Index

Maine Department of Environmental Protection