Portsmouth Seasonal Pollution
Portsmouth usually records its highest OpenAQ-derived EPA AQI in May and its cleanest month in December. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Portsmouth, United Kingdom.
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Average EPA AQI
14
Rank 166 of 171 cities by average AQI
PM2.5
n/a
ug/m3 annualized city average
Seasonality
May
Cleanest: December
Health indicator
n/a
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Portsmouth
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-
15
14
16
15
14
15
14
15
16
9
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Portsmouth, the current global analytics build covers 217 daily rows from 2024-03-26 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.