SmogRank / World / Latvia / April 2023
Most polluted cities in Latvia, April 2023
2 cities in Latvia ranked by their average PM2.5 over the 30 days. Worst: Riga at 9.9 µg/m³, #404 of 1,360 cities in the world. Cleanest: Ventspils at 8.8. 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.
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 · Latvia now
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SmogRank, most polluted cities in Latvia, PM2.5, April 2023, smogrank.com/lv/history/2023-04 (accessed 2 Oct 2026).
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