Air Quality Index Formula
Calculates Air Quality Index from pollutant concentration.
Formula
AQI = ((IHi - ILo)/(CHi - CLo)) × (C - CLo) + ILo
Discipline: Environmental Engineering. Result unit: dimensionless.
Variables and units
- AQI — AQI: Air Quality Index
- IHi — Index High: Upper AQI breakpoint
- ILo — Index Low: Lower AQI breakpoint
- CHi — Concentration High (μg/m³): Upper concentration breakpoint
- CLo — Concentration Low (μg/m³): Lower concentration breakpoint
- C — Concentration (μg/m³): Pollutant concentration