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.

AQI charts — which look at the amount of PM2.5 and other pollutants like ozone in the air — are typically displayed in different tiers: 0 to 50 – The air is good.

The EPA's AQI ranges from 0 to 500 and represents the measurement of these five different major pollutants regulated by the Clean Air Act.

Air Quality Index, or AQI, and PM2.5, particulate matter which measures 2.5 micrometers or less, are not the same thing. But both do refer to how polluted the air is, just in different ways.

Air quality in the U.S. is measured by the Environmental Protection Agency (EPA) using an air quality index (AQI), which rates air quality on a scale of zero to 500. To determine a location’s ...

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.