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The EPA's Air Quality Index can tell you whether breathing outside air can be harmful. Here's how to read the scale to plan ...
The building heat and humidity comes as Chicago's air quality readings early Monday morning were "unhealthy for sensitive groups," the website AirNow.gov said. The air quality ranked as a level three ...
The DEC has issued an air quality health advisory for most of upstate New York due to elevated levels of fine particulate ...
Fine particle levels are expected to reach the purple air quality index category, which means it is considered “very ...
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.” ...
Unhealthy Air Quality Index level. Red: Indexes in the 151 to 200 range are considered "unhealthy." At this level, any member of the general public becomes susceptible to health effects.