Shah Alam Seasonal Pollution
Shah Alam usually records its highest OpenAQ-derived EPA AQI in March and its cleanest month in October. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Selangor, Malaysia.
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Average EPA AQI
90
Rank 1 of 2 cities by average AQI
PM2.5
29.4
ug/m3 annualized city average
Seasonality
March
Cleanest: October
Health indicator
1.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Shah Alam
96
110
113
113
95
94
103
93
69
63
65
70
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Shah Alam, the current global analytics build covers 356 daily rows from 2024-01-09 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.