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Air Quality Data provided by the Air Quality in Virginia (deq.virginia.gov)
Note that the measurements for PM2.5 (小粒子状物質) and PM10 (吸入性粒子状物質) are taken from the station Ashburn - Broad Run High School, Northern Virginia and the measurements for SO2 (二酸化硫黄) and CO (一酸化炭素) are taken from the station Lee District Park - Fairfax County, Northern Virginia