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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

0501002024Hwlffordd

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.

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