AERSI goes beyond snapshot AQI to measure how intense, persistent, and volatile air pollution exposure really is — across 547 stations in India, updated every day.
WHO-normalized weighted index across PM2.5, PM10, NO2, Ozone, and SO2 — giving fine particulates the weight they deserve based on health research.
How often does a station cross the unsafe threshold? A city that's polluted 25 out of 30 days is fundamentally different from one with rare spikes.
Unpredictable swings cause acute health events. A station that jumps from clean to toxic without warning is penalized — people can't adapt to what they can't predict.
AERSI = 1.0 is the baseline — exactly at WHO safety thresholds with no exceedances.