How U.S. embassies & consulates report the U.S. AQI
- Post report the U.S. Environmental Protection Agency’s (EPA) NowCast AQI to describe recent air quality.
- The NowCast AQI is based on fine particles (PM2.5) or ozone levels averaged up to several hours.
- Pollutant levels are converted to an index value and put into a color-coded category: good to Hazardous.
- Good and Moderate means air pollution is below the standards that EPA has set to protect human health.
- Good AQI poses low health risk.
- Hazardous AQI poses high risk for everyone.
- All posts report a NowCast AQI for PM2.5
- Posts that measure ozone report a separate Nowcast AQI for ozone.
- EPA also has a daily AQI based on daily levels of 5 pollutants: PM2.5, ozone, nitrogen dioxide, sulfur dioxide, carbon monoxide. The highest index value is reported.