Hamilton AQI Trends
Hamilton AQI was measured across 2024-2025, with a trend delta of n/a AQI points. The page uses OpenAQ-derived daily history for 5 mapped monitoring locations in Ontario, Canada.
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Average EPA AQI
40
Rank 20 of 158 cities by average AQI
PM2.5
8.2
ug/m3 annualized city average
Seasonality
August
Cleanest: November
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Hamilton
42
42
32
33
44
41
42
46
45
35
31
45
What this trends page measures
Compare yearly air-quality direction, best years, worst years, and trend deltas.
For Hamilton, the current global analytics build covers 367 daily rows from 2024-01-01 to 2025-01-01. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.