Cornwall Seasonal Pollution
Cornwall usually records its highest OpenAQ-derived EPA AQI in August and its cleanest month in April. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Ontario, Canada.
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Average EPA AQI
32
Rank 76 of 158 cities by average AQI
PM2.5
6.1
ug/m3 annualized city average
Seasonality
August
Cleanest: April
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Cornwall
37
39
24
19
29
31
36
41
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-
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What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Cornwall, the current global analytics build covers 227 daily rows from 2024-01-01 to 2024-08-15. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.