Turn concentrations into sub-AQIs; overall AQI is the dominant (maximum) pollutant.
Last Updated: 31 Jan 2026
US EPA-style sub-indices from concentration breakpoints; overall AQI is the maximum of included pollutants. Not a substitute for regulatory monitors or AirNow averaging rules.
Overall AQI: 84 Moderate
Dominant (max): PM2.5 (24h)
| Pollutant | Conc. | Sub-AQI |
|---|---|---|
| PM2.5 (24h) | 28 µg/m³ | 84 |
| PM10 (24h) | 45 µg/m³ | 42 |
| NO₂ (1h) | 38 ppb | 36 |
| O₃ (8h) | 55 ppb | 51 |
AQI Calculator (PM2.5, PM10, NO₂, O₃) helps you turn concentrations into sub-aqis; overall aqi is the dominant (maximum) pollutant. It is commonly used by engineers, lab users, field operators for aqi calculator, pm2.5 aqi, air quality index.
What it does
Uses EPA-style breakpoint tables (piecewise linear) for:
- PM2.5 (24-hour average, µg/m³)
- PM10 (24-hour average, µg/m³)
- NO₂ (1-hour average, ppb)
- O₃ (8-hour average, ppb)
Overall AQI is the maximum of whichever pollutants you include. This does not replicate AirNow NowCast, official QA, or local rounding rules.
City presets are static, illustrative mixes for demos—not live air quality.