Portela Seasonal Pollution
Portela usually records its highest OpenAQ-derived EPA AQI in January and its cleanest month in March. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Lisboa, Portugal.
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Average EPA AQI
49
Rank 3 of 58 cities by average AQI
PM2.5
11.2
ug/m3 annualized city average
Seasonality
January
Cleanest: March
Health indicator
0.5
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Portela
54
49
34
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What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Portela, the current global analytics build covers 68 daily rows from 2024-01-01 to 2024-09-22. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.