Alton Seasonal Pollution
Alton usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in December. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Hampshire, United Kingdom.
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Average EPA AQI
43
Rank 35 of 171 cities by average AQI
PM2.5
9.4
ug/m3 annualized city average
Seasonality
November
Cleanest: December
Health indicator
0.4
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Alton
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What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Alton, the current global analytics build covers 46 daily rows from 2024-11-16 to 2024-12-31. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.