An air quality alert was issued by the National Weather Service in-Sullivan at 1:52 p.m. on Wednesday, July 23.

After nearly two days under an Air Quality Warning issued by Environment and Climate Change Canada, we're taking a look at ...

AirNow and PurpleAir use the Air Quality Index, or A.Q.I., a measure of air quality from 0 to 500 that is composed of six categories, from “good” to “hazardous.” ...