Westminster Seasonal Pollution
Westminster usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in July. The page uses OpenAQ-derived daily history for 6 mapped monitoring locations in Westminster, United Kingdom.
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Average EPA AQI
38
Rank 66 of 171 cities by average AQI
PM2.5
7.6
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
Westminster
42
31
38
26
45
36
26
34
37
36
59
41
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Westminster, the current global analytics build covers 366 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.