Air Exposure
Severity Index
AERSI extends the snapshot AQI provides — measuring how intense, persistent, and volatile air pollution exposure really is across 530+ stations in India, updated every day.
AQI tells you the moment.
AERSI tells you the story.
Pollution Load
WHO-normalized weighted index across PM2.5, PM10, NO2, Ozone, and SO2. Fine particulates get the weight they deserve based on epidemiological evidence.
Exposure Persistence
How often does a station cross the unsafe threshold over 30 days? Persistent pollution is fundamentally more damaging than rare spikes of equal magnitude.
Volatility Severity
Unpredictable swings cause acute health events. A station jumping from clean to toxic without warning is penalized — people can't adapt to what they can't predict.
Reading the Index
AERSI = 1.0 is the baseline — a station exactly at WHO limits, zero exceedances, zero volatility.