According to the US Environmental Protection Agency (EPA ... The EPA measures regional air quality index (AQI) by how hazardous it is to the general public. Discover the AQI in your city by ...

This measure, based on data from the Environmental Protection Agency, evaluates states on the number of days the Air Quality Index in counties was not rated “good.” U.S. News calculated a ...

What is the Air Quality Index, or AQI? The Air Quality Index ... If you can't, wear a high-quality mask, like an N95 mask — or at least a surgical mask or some kind of face covering.

Rather than relying solely on the Air Quality Index, Wexler recommends checking out PurpleAir Map, which tells you where ... or are in an area with high AQI levels. That means don’t exercise ...