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.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Tuxtla 16% 10%0
Every city in Mexico ranked for September 2026, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1TuxtlaChiapas
    16%
  2. 2SaltilloCoahuila
    9%
  3. 3TijuanaBaja California
    8%
  4. 4MexicaliBaja California
    7%
  5. 5IrapuatoGuanajuato
    4%
  6. 6Hacienda Santa FeJalisco
    0%
  7. 7San Antonio la IslaMéxico
    0%
  8. 8Ciudad NezahualcoyotlMéxico
    0%
  9. 9Naucalpan de JuárezMéxico
    0%
  10. 9Santa AnitaJalisco
    0%
  11. 11GuadalajaraJalisco
    0%
  12. 12AguascalientesAguascalientes
    0%
  13. 13PueblaPuebla
    0%
  14. 14Atotonilco de TulaHidalgo
    0%
  15. 15Parque Industrial Ciudad MitrasNuevo León
    0%
  16. 16Ciudad General EscobedoNuevo León
    0%
  17. 17Mexico CityMexico City
    0%
  18. 18TlaquepaqueJalisco
    0%
  19. 19CelayaGuanajuato
    0%
  20. 20SalamancaGuanajuato
    0%
  21. 21Ciudad ApodacaNuevo León
    0%
  22. 22León de los AldamaGuanajuato
    0%
  23. 23MonterreyNuevo León
    0%
  24. 24Santa CatarinaNuevo León
    0%
  25. 25TulancingoHidalgo
    0%
  26. 25San Luis de la PazGuanajuato
    0%
  27. 27ZapopanJalisco
    0%
  28. 28TepicNayarit
    0%
  29. 29Ciudad Benito JuárezNuevo León
    0%
  30. 30Santiago de QuerétaroQuerétaro
    0%
  31. 31San Juan del RíoQuerétaro
    0%
  32. 32Cadereyta JiménezNuevo León
    0%
  33. 33PesqueríaNuevo León
    0%
  34. 34Heroica MatamorosTamaulipas
    0%
  35. 35Tula de AllendeHidalgo
    0%
  36. 36GarcíaNuevo León
    0%
  37. 36La Providencia Siglo XXIHidalgo
    0%
  38. 38Pachuca de SotoHidalgo
    0%
  39. 39San Miguel de AllendeGuanajuato
    0%
  40. 39AbasoloGuanajuato
    0%
  41. 41Zacatepec de HidalgoMorelos
    0%
  42. 42NogalesSonora
    0%
  43. 43Ciudad 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 6 Oct 2026).

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