SmogRank / World / Mexico / Baja California / 2023
Most polluted cities in Baja California, Mexico, 2023
1 city in Baja California, Mexico ranked by their average PM2.5 over the 365 days; 1 above the WHO annual guideline (5.0 µg/m³). The only one: Tijuana at 20.9 µg/m³, #76 of 1,302 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 56 of these 365 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.
- 1Tijuana 734.2×
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
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SmogRank, most polluted cities in Baja California, Mexico, PM2.5, 2023, smogrank.com/mx/region/baja-california/history/2023 (accessed 7 Oct 2026).
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.