Marinha Grande Seasonal Pollution
Marinha Grande usually records its highest OpenAQ-derived EPA AQI in February and its cleanest month in August. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Leiria, Portugal.
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Average EPA AQI
47
Rank 6 of 58 cities by average AQI
PM2.5
10.9
ug/m3 annualized city average
Seasonality
February
Cleanest: August
Health indicator
0.5
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Marinha Grande
51
55
39
-
-
-
-
19
-
24
-
-
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Marinha Grande, the current global analytics build covers 77 daily rows from 2024-01-01 to 2024-10-23. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.