Matosinhos Seasonal Pollution
Matosinhos usually records its highest OpenAQ-derived EPA AQI in September and its cleanest month in October. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Porto, Portugal.
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Average EPA AQI
20
Rank 33 of 58 cities by average AQI
PM2.5
n/a
ug/m3 annualized city average
Seasonality
September
Cleanest: October
Health indicator
n/a
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Matosinhos
22
26
19
22
18
22
19
21
31
15
17
21
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Matosinhos, the current global analytics build covers 282 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.