SmogRank / World / Mexico / 2026
Most polluted cities in Mexico, 2026
46 cities in Mexico ranked by their average PM2.5 so far (278 of 365 days); 46 above the WHO annual guideline (5.0 µg/m³). Worst: Tuxtla at 30.1 µg/m³, #187 of 2,745 cities in the world. Cleanest: Nogales at 10.2. A city needs measurements on 70% of the days to be ranked.
About 729K people in these 16 cities breathed unhealthy air on an average day of 2026.
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 181K
- 2AguascalientesAguascalientes 134K
- 3TlaquepaqueJalisco 93.2K
- 4GuadalajaraJalisco 70.8K
- 5Ciudad NezahualcoyotlMéxico 66.4K
- 6MexicaliBaja California 63.8K
- 7PueblaPuebla 42.8K
- 8Ciudad JuárezChihuahua 27.2K
- 9León de los AldamaGuanajuato 13.5K
- 10Santiago de QuerétaroQuerétaro 11.6K
- 11Pachuca de SotoHidalgo 5.97K
- 12ZapopanJalisco 5.31K
- 13MonterreyNuevo León 4.21K
- 14Ciudad General EscobedoNuevo León 3.6K
- 15Santa CatarinaNuevo León 3.55K
- 16CelayaGuanajuato 1.55K
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, 2026 · Mexico now
Regions
Ranked cities in each region, 2026.
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SmogRank, most polluted cities in Mexico, PM2.5, 2026 (so far), smogrank.com/mx/history/2026 (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.