Colombo Seasonal Pollution
Colombo usually records its highest OpenAQ-derived EPA AQI in March and its cleanest month in August. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Western Province, Sri Lanka.
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Average EPA AQI
64
Rank 2 of 3 cities by average AQI
PM2.5
17.4
ug/m3 annualized city average
Seasonality
March
Cleanest: August
Health indicator
0.8
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Colombo
91
97
99
63
54
50
42
40
44
42
63
88
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Colombo, the current global analytics build covers 312 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.