DC’s air quality has improved dramatically over the last 20 years.
According to the Metropolitan Washington Council of Governments’ , there were only three designated unhealthy air days in 2022. In contrast, there were 77 designated unhealthy air days 10 years ago in 2002.
Of the three unhealthy air days in 2022, the McMillan monitor went off on all three: June 15, June 22, and June 30. On June 30, four other monitors also went off—including the Prince George’s County monitor. The other two days, only the McMillan location was set off. Recirculation, a wind pattern that Kumar said uniquely impacts the District, keeps polluted air in DC. “The air in the DC area keeps moving in the DC area, it doesn’t go out,” Kumar says, which means it doesn’t have the chance to get diluted. The impact is made worse when the temperatures rise.
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