Coulsdon Seasonal Pollution
Coulsdon usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in December. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Croydon, United Kingdom.
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Average EPA AQI
48
Rank 15 of 171 cities by average AQI
PM2.5
12.1
ug/m3 annualized city average
Seasonality
November
Cleanest: December
Health indicator
0.5
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Coulsdon
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48
40
67
39
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Coulsdon, the current global analytics build covers 122 daily rows from 2024-09-01 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.