Air Pollution in Crofton: Real-time Air Quality Index and smog alert. How polluted is the air today in Crofton? What is the air quality now in Crofton? Crofton,PM2.5,AQI,Air Quality Index,Pollution Index,Pollution,historical data,PM10,respirable particulate matter,NO2,nitrogen dioxide,SO2,sulfur dioxide,CO,carbon monoxide,O3,ozone,smog,forecast Pollution in Crofton Pollution in Crofton Air Pollution in Crofton: Real-time Air Quality Index and smog alert. Air pollution in Crofton from November 2018 to November 2018 index index