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env.air-quality-index Calculator
Calculates the Air Quality Index (AQI) from measured concentrations of PM2.5, PM10, ozone, or NO₂ using EPA breakpoint tables, and gives the corresponding health category. AQI above 100 is 'Unhealthy for Sensitive Groups'; above 150 affects everyone.
Inputs
Pm25 Ugm3
Amount of solute per unit volume. Higher concentration = more solute dissolved.
O3 Ppb
Reference formula or conversion factor shown for context.
Co Ppm
Reference formula or conversion factor shown for context.
No2 Ppb
Reference formula or conversion factor shown for context.
Results
PM2.5 AQI
Reference formula or conversion factor shown for context.
O3 AQI (if measured)
Reference formula or conversion factor shown for context.
PM2.5 category
The classification bucket this result falls into based on the computed value and the applicable reference scale.
PM2.5 level
The measured or computed level on the applicable scale.