ການພະຍາກອນຄຸນນະພາບອາກາດ
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ຂໍ້ມູນຄຸນນະພາບອາກາດສະໜອງໃຫ້ໂດຍ: the Air Quality in Virginia (deq.virginia.gov) and Air Now - US EPA (airnow.gov)
Note that the measurement for PM10 (respirable particulate matter) are taken from the station: Shenandoah National Park - Big Meadows, Shenandoah National Park