SmogRank / World / Mexico / September 2026

Most polluted cities in Mexico, September 2026

43 cities in Mexico ranked by their average PM2.5 over the 30 days. Worst: Tuxtla at 29.1 µg/m³, #134 of 2,949 cities in the world. Cleanest: Ciudad Juárez at 7.0. A city needs measurements on 70% of the days to be ranked.

About 68.8K people in these 17 cities breathed unhealthy air on an average day of September 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.

← Mexicali 68.8K 60K0
Every city in Mexico ranked for September 2026 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1MexicaliBaja California
    68.8K
  2. 2Ciudad NezahualcoyotlMéxico
    0
  3. 3GuadalajaraJalisco
    0
  4. 4AguascalientesAguascalientes
    0
  5. 5PueblaPuebla
    0
  6. 6Ciudad General EscobedoNuevo León
    0
  7. 7Mexico CityMexico City
    0
  8. 8TlaquepaqueJalisco
    0
  9. 9CelayaGuanajuato
    0
  10. 10León de los AldamaGuanajuato
    0
  11. 11MonterreyNuevo León
    0
  12. 12Santa CatarinaNuevo León
    0
  13. 13ZapopanJalisco
    0
  14. 14TepicNayarit
    0
  15. 15Santiago de QuerétaroQuerétaro
    0
  16. 16Pachuca de SotoHidalgo
    0
  17. 17Ciudad JuárezChihuahua
    0
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, September 2026 · Mexico now

Regions

Aguascalientes 1Baja California 2Chiapas 1Chihuahua 1Coahuila 1Guanajuato 7Hidalgo 5Jalisco 5México 3Mexico City 1Morelos 1Nayarit 1Nuevo León 9Puebla 1Querétaro 2Sonora 1Tamaulipas 1

Ranked cities in each region, September 2026.

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SmogRank, most polluted cities in Mexico, PM2.5, September 2026, smogrank.com/mx/history/2026-09 (accessed 7 Oct 2026).

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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.