The U.S. Air Quality Index (AQI) is the Environmental Protection Agency’s tool for reporting outdoor air quality and health.

charts can help you determine if you can safely workout, while outside. The AQI scale ranges from 0 to 500 and includes different tiers associated with various health risks for different groups of ...

As the chart shows, for PM2.5 concentrations up to 60 microgram per cubic metre (µg/m3), AQI increases by 1.67 for every 1µg/m3 increase in PM2.5 concentration. This happens in the AQI range of ...

air quality in areas along the West Coast and inland as far as South Dakota ranges from “unhealthy” to “hazardous” on the air quality index (AQI). “Right now we need to establish a ...