ການພະຍາກອນຄຸນນະພາບອາກາດ
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ຂໍ້ມູນຄຸນນະພາບອາກາດສະໜອງໃຫ້ໂດຍ: the Washington State Department of Ecology (ecy.wa.gov)
Note that the measurements for PM2.5 (fine particulate matter) and NO2 (nitrogen dioxide) are taken from the station: S 36th St, Tacoma, Washington