SmogRank / World / United Kingdom / Wales / February 2024

Most polluted cities in Wales, United Kingdom, February 2024

4 cities in Wales, United Kingdom ranked by their average PM2.5 over the 29 days. Worst: Cardiff at 9.2 µg/m³, #781 of 2,437 cities in the world. Cleanest: Chepstow at 5.3. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for one of these days. Cities in the United States and Europe have it from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.

← Cardiff 9.2 µg/m³ 20 µg/m³0
Every city in Wales, United Kingdom ranked for February 2024, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1Cardiff
    51
  2. 2Cwmafan
    41
  3. 3Newport
    34
  4. 4Chepstow
    29
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, February 2024 · All cities in United Kingdom, February 2024 · Wales now

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SmogRank, most polluted cities in Wales, United Kingdom, PM2.5, February 2024, smogrank.com/gb/region/wales/history/2024-02 (accessed 8 Oct 2026). Some readings from Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.