Perth Seasonal Pollution
Perth usually records its highest OpenAQ-derived EPA AQI in June and its cleanest month in March. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Western Australia, Australia.
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Average EPA AQI
22
Rank 42 of 59 cities by average AQI
PM2.5
4.3
ug/m3 annualized city average
Seasonality
June
Cleanest: March
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Perth
28
19
15
16
23
35
21
20
32
19
17
28
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Perth, the current global analytics build covers 327 daily rows from 2024-01-10 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.