Hilsea Seasonal Pollution
Hilsea usually records its highest OpenAQ-derived EPA AQI in January and its cleanest month in April. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Portsmouth, United Kingdom.
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Average EPA AQI
37
Rank 70 of 171 cities by average AQI
PM2.5
7.4
ug/m3 annualized city average
Seasonality
January
Cleanest: April
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Hilsea
47
36
40
31
43
34
32
39
35
33
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-
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Hilsea, the current global analytics build covers 266 daily rows from 2024-01-01 to 2024-10-26. The calculations normalize PM2.5 and PM10 observations into US EPA AQI bands so country, city, and tool pages use one consistent method.