Thornton Heath Seasonal Pollution
Thornton Heath usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in July. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Croydon, United Kingdom.
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Average EPA AQI
34
Rank 97 of 171 cities by average AQI
PM2.5
6.7
ug/m3 annualized city average
Seasonality
November
Cleanest: July
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Thornton Heath
39
26
32
25
37
31
25
33
37
36
53
39
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Thornton Heath, the current global analytics build covers 345 daily rows from 2024-01-01 to 2024-12-31. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.