Rio de Janeiro Seasonal Pollution
Rio de Janeiro usually records its highest OpenAQ-derived EPA AQI in September and its cleanest month in November. The page uses OpenAQ-derived daily history for 5 mapped monitoring locations in Rio de Janeiro, Brazil.
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Average EPA AQI
52
Rank 3 of 4 cities by average AQI
PM2.5
13.5
ug/m3 annualized city average
Seasonality
September
Cleanest: November
Health indicator
0.6
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Rio de Janeiro
40
39
36
54
61
75
66
65
76
41
34
37
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Rio de Janeiro, the current global analytics build covers 358 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.