대기질 데이터 제공: the Bureau of Air Quality, Pennsylvania's Department of Environmental Protection (dep.pa.gov) and Air Now - US EPA (airnow.gov)
PM 2.5 (미세먼지)에 대한 측정값은 관측소에서 가져온 것입니다. USA:Pennsylvania/Allegheny/Liberty and the measurements for PM10 (respirable particulate matter), O3 (ozone) and CO (carbon monoxide) are taken from the station: Glassport High Street, Allegheny, Pennsylvania