Norwich Seasonal Pollution
Norwich usually records its highest OpenAQ-derived EPA AQI in March and its cleanest month in April. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Norfolk, United Kingdom.
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Average EPA AQI
35
Rank 89 of 171 cities by average AQI
PM2.5
7.0
ug/m3 annualized city average
Seasonality
March
Cleanest: April
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Norwich
37
32
45
26
44
31
27
33
38
34
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-
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Norwich, the current global analytics build covers 287 daily rows from 2024-01-01 to 2024-10-26. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.