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ຂໍ້ມູນຄຸນນະພາບອາກາດສະໜອງໃຫ້ໂດຍ: the Bureau of Air Quality, Pennsylvania's Department of Environmental Protection (dep.pa.gov)
Note that the measurements for O3 (ozone) and CO (carbon monoxide) are taken from the station: Flag Plaza, Allegheny, Pennsylvania