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.

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 21% 20%0
Every city in Mexico ranked for 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
    21%
  2. 2AguascalientesAguascalientes
    19%
  3. 3TlaquepaqueJalisco
    14%
  4. 4Hacienda Santa FeJalisco
    14%
  5. 5San Luis PotosíSan Luis Potosí
    13%
  6. 6TijuanaBaja California
    11%
  7. 7Zacatepec de HidalgoMorelos
    9%
  8. 8MexicaliBaja California
    6%
  9. 9Ciudad NezahualcoyotlMéxico
    6%
  10. 10GuadalajaraJalisco
    5%
  11. 11Ciudad Benito JuárezNuevo León
    4%
  12. 12Naucalpan de JuárezMéxico
    4%
  13. 13IrapuatoGuanajuato
    3%
  14. 14PueblaPuebla
    3%
  15. 15Pachuca de SotoHidalgo
    2%
  16. 16Ciudad JuárezChihuahua
    2%
  17. 17Mexico CityMexico City
    1%
  18. 18Mixquiahuala de JuárezHidalgo
    1%
  19. 19Cadereyta JiménezNuevo León
    1%
  20. 20Santa CatarinaNuevo León
    1%
  21. 21La Providencia Siglo XXIHidalgo
    1%
  22. 22San MarcosHidalgo
    1%
  23. 23Atotonilco de TulaHidalgo
    1%
  24. 24AbasoloGuanajuato
    1%
  25. 25CuernavacaMorelos
    1%
  26. 26León de los AldamaGuanajuato
    1%
  27. 27TehuacánPuebla
    1%
  28. 28PesqueríaNuevo León
    1%
  29. 29Heroica MatamorosTamaulipas
    1%
  30. 30Ciudad General EscobedoNuevo León
    1%
  31. 31Ciudad ApodacaNuevo León
    1%
  32. 32Santiago de QuerétaroQuerétaro
    1%
  33. 33San Luis de la PazGuanajuato
    0%
  34. 34CelayaGuanajuato
    0%
  35. 35San Miguel de AllendeGuanajuato
    0%
  36. 36MonterreyNuevo León
    0%
  37. 37ZapopanJalisco
    0%
  38. 38Santa AnitaJalisco
    0%
  39. 39Parque Industrial Ciudad MitrasNuevo León
    0%
  40. 40SalamancaGuanajuato
    0%
  41. 41TulancingoHidalgo
    0%
  42. 42San Juan del RíoQuerétaro
    0%
  43. 43Tula de AllendeHidalgo
    0%
  44. 44GuanajuatoGuanajuato
    0%
  45. 45GarcíaNuevo León
    0%
  46. 46NogalesSonora
    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, 2026 · Mexico now

Regions

Aguascalientes 1Baja California 2Chiapas 1Chihuahua 1Guanajuato 8Hidalgo 7Jalisco 5México 2Mexico City 1Morelos 2Nuevo León 9Puebla 2Querétaro 2San Luis Potosí 1Sonora 1Tamaulipas 1

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 6 Oct 2026).

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