SmogRank / World / Sri Lanka / January 2023

Most polluted cities in Sri Lanka, January 2023

1 city in Sri Lanka ranked by their average PM2.5 over the 31 days. Worst: Colombo at 36.8 µg/m³, #36 of 1,078 cities in the world. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 7 of these 31 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.

  1. 1ColomboWestern Province
    104
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, January 2023 · Sri Lanka now

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SmogRank, most polluted cities in Sri Lanka, PM2.5, January 2023, smogrank.com/lk/history/2023-01 (accessed 3 Oct 2026).

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