Downham Market Seasonal Pollution
Downham Market 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 Norfolk, United Kingdom.
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Average EPA AQI
56
Rank 3 of 171 cities by average AQI
PM2.5
15.0
ug/m3 annualized city average
Seasonality
November
Cleanest: December
Health indicator
0.7
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Downham Market
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58
50
66
49
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Downham Market, the current global analytics build covers 112 daily rows from 2024-08-30 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.