SmogRank / World / United Kingdom / Wales / April 2023

Most polluted cities in Wales, United Kingdom, April 2023

4 cities in Wales, United Kingdom ranked by their average PM2.5 over the 30 days. Worst: Cardiff at 13.4 µg/m³, #198 of 1,567 cities in the world. Cleanest: Newport at 8.1. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 3 of these 30 days. Cities in the United States and Europe have them 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 13.4 µg/m³ 20 µg/m³0
Every city in Wales, United Kingdom ranked for April 2023, 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
    59
  2. 2Cwmafan
    54
  3. 3Chepstow
    53
  4. 4Newport
    45
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, April 2023 · All cities in United Kingdom, April 2023 · Wales now

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SmogRank, most polluted cities in Wales, United Kingdom, PM2.5, April 2023, smogrank.com/gb/region/wales/history/2023-04 (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.