Horta Seasonal Pollution
Horta usually records its highest OpenAQ-derived EPA AQI in January and its cleanest month in December. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Azores, Portugal.
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Average EPA AQI
23
Rank 26 of 58 cities by average AQI
PM2.5
5.1
ug/m3 annualized city average
Seasonality
January
Cleanest: December
Health indicator
0.2
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Horta
39
39
13
14
-
-
-
-
24
18
15
13
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Horta, the current global analytics build covers 170 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.