Balham Seasonal Pollution
Balham usually records its highest OpenAQ-derived EPA AQI in June and its cleanest month in April. The page uses OpenAQ-derived daily history for 4 mapped monitoring locations in Wandsworth, United Kingdom.
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Average EPA AQI
24
Rank 140 of 171 cities by average AQI
PM2.5
8.2
ug/m3 annualized city average
Seasonality
June
Cleanest: April
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Balham
19
14
17
13
26
43
36
21
20
18
24
32
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Balham, the current global analytics build covers 341 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.