SmogRank / World / Mexico / 2025
Most polluted cities in Mexico, 2025
28 cities in Mexico ranked by their average PM2.5 over the 365 days; 28 above the WHO annual guideline (5.0 µg/m³). Worst: Tlaquepaque at 26.3 µg/m³, #190 of 2,624 cities in the world. Cleanest: Heroica Matamoros at 9.7. A city needs measurements on 70% of the days to be ranked.
About 688K people in these 14 cities breathed unhealthy air on an average day of 2025.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
- 1Mexico CityMexico City 184K
- 2MexicaliBaja California 127K
- 3TlaquepaqueJalisco 116K
- 4AguascalientesAguascalientes 89.1K
- 5Ciudad JuárezChihuahua 80.4K
- 6MonterreyNuevo León 40.6K
- 7Santa CatarinaNuevo León 16.3K
- 8PueblaPuebla 11.4K
- 9León de los AldamaGuanajuato 11.3K
- 10ZapopanJalisco 10.1K
- 11CelayaGuanajuato 1.12K
- 12Pachuca de SotoHidalgo 991
- 13TepicNayarit 0
- 14Santiago de QuerétaroQuerétaro 0
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, 2025 · Mexico now
Regions
Ranked cities in each region, 2025.
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SmogRank, most polluted cities in Mexico, PM2.5, 2025, smogrank.com/mx/history/2025 (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.