Hornchurch Seasonal Pollution
Hornchurch usually records its highest OpenAQ-derived EPA AQI in May and its cleanest month in October. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Havering, United Kingdom.
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Average EPA AQI
28
Rank 133 of 171 cities by average AQI
PM2.5
5.6
ug/m3 annualized city average
Seasonality
May
Cleanest: October
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Hornchurch
33
26
31
21
35
29
21
28
31
19
34
19
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Hornchurch, the current global analytics build covers 334 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.