AQI Comparison
AQI 50 vs AQI 450
A one-step AQI category change can mean a meaningful increase in estimated PM2.5 concentration-time.
AQI 50
0.41
cigarette-equivalents per 24h
Good: Most people can keep their normal routine.
AQI 450
13.65
cigarette-equivalents per 24h
Hazardous: Treat this as a severe exposure event.
What changes between these two AQI values
Difference in PM2.5
291.3
µg/m³
Difference per day
13.24
cigarettes
Direction
AQI 450 is materially heavier exposure
Moving from AQI 50 to AQI 450 changes both estimated PM2.5 concentration and the protection plan.
Calculate AQI 50
Open the interactive calculator with AQI 50 loaded.
Calculate AQI 450
Use the interactive calculator to test a different duration.
See how the numbers are derived
Review the AQI-to-PM2.5 and PM2.5-to-cigarettes methodology.