São Tiago de Custoias Seasonal Pollution
São Tiago de Custoias usually records its highest OpenAQ-derived EPA AQI in February and its cleanest month in July. The page uses OpenAQ-derived daily history for 2 mapped monitoring locations in Porto, Portugal.
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Average EPA AQI
19
Rank 37 of 58 cities by average AQI
PM2.5
n/a
ug/m3 annualized city average
Seasonality
February
Cleanest: July
Health indicator
n/a
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
São Tiago de Custoias
31
35
15
16
-
12
9
11
-
10
-
-
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For São Tiago de Custoias, the current global analytics build covers 154 daily rows from 2024-01-01 to 2024-11-03. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.