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Air Quality Index Explained: What AQI Numbers Mean
In brief
The Air Quality Index (AQI) translates pollutant measurements into a simple scale so people can decide on outdoor activity. Scales can differ slightly by country — use your national environment agency’s map.
The Air Quality Index (AQI) translates pollutant measurements into a simple scale so people can decide on outdoor activity. Scales can differ slightly by country — use your national environment agency’s map.
What do AQI categories mean?
Sensitive groups should act earlier when AQI rises.
Where should you check AQI?
Wildfire smoke and urban traffic are common drivers of spikes.
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Last updated: 12 Oct 2026. Re-check linked official sources before citing figures.
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People also ask
Is AQI the same worldwide?
Categories are similar but not identical — use local official scales.
Does rain always clear air?
It can help, but not always immediately.
Is this medical advice?
No — follow local health guidance.
Sources
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