EPA Air Quality Index (AQI) Explained — PM2.5, Ozone, NO₂, SO₂, CO

EPA Air Quality Index (AQI) Explained — PM2.5, Ozone, NO₂, SO₂, COThe 0–500 AQI scale, six health categories (Good through Hazardous), and per-pollutant breakpoints for PM2.5, PM10, ozone, NO₂, SO₂, and CO.Part of the BloomWX learn library — beginner-friendly explainers covering every surface of the BloomWX weather dashboard. Open BloomWX to see live data for any U.S. county.