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Air Quality Data provided by the Washington State Department of Ecology (ecy.wa.gov)
Note that the measurements for PM2.5 (小粒子状物質), O3 (オゾン), CO (一酸化炭素) and NO2 (二酸化窒素) are taken from the station 10th and Weller, Seattle, Washington and the measurement for and SO2 (二酸化硫黄) are taken from the station Beacon Hill, Seattle, Washington