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Air Quality Data provided by the Air Quality in Virginia (deq.virginia.gov)
Note that the measurements for PM2.5 (тонкодисперсных частиц) and PM10 (вдыхаемых твердых частиц) are taken from the station Ashburn - Broad Run High School, Northern Virginia and the measurements for SO2 (сернистый газ) and CO (окись углерода) are taken from the station Lee District Park - Fairfax County, Northern Virginia