Sines Seasonal Pollution
Sines usually records its highest OpenAQ-derived EPA AQI in July and its cleanest month in September. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Setúbal, Portugal.
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Average EPA AQI
43
Rank 10 of 58 cities by average AQI
PM2.5
23.8
ug/m3 annualized city average
Seasonality
July
Cleanest: September
Health indicator
1.1
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Sines
25
56
20
29
83
64
92
21
14
17
48
23
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Sines, the current global analytics build covers 333 daily rows from 2024-01-01 to 2024-12-30. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.