Hwlffordd Seasonal Pollution
Hwlffordd usually records its highest OpenAQ-derived EPA AQI in November and its cleanest month in July. The page uses OpenAQ-derived daily history for 1 mapped monitoring location in Pembrokeshire, United Kingdom.
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Average EPA AQI
29
Rank 127 of 171 cities by average AQI
PM2.5
5.5
ug/m3 annualized city average
Seasonality
November
Cleanest: July
Health indicator
0.3
cigarette-equivalent per day
Yearly EPA AQI trend
Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Hwlffordd
31
25
32
26
33
29
19
30
32
28
37
24
What this seasonality page measures
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI.
For Hwlffordd, the current global analytics build covers 353 daily rows from 2024-01-01 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.