In 2021, there were 28 moderately unhealthy days, three more than last year.
Unfavorable 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.
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.
In 2021, there were 28 moderate air quality days, and 4 days rated unhealthy for sensitive groups. After declining in the 1980s and 1990s, air quality in Maine has improved substantially, and is better than other Northeastern states.
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Maine Air Quality Index
Maine Department of Environmental Protection