SmogRank / World / Mexico / May 2026

Most polluted cities in Mexico, May 2026

43 cities in Mexico ranked by their average PM2.5 over the 31 days. Worst: Hacienda Santa Fe at 32.5 µg/m³, #154 of 2,852 cities in the world. Cleanest: Nogales at 9.5. 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.

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

Regions

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

Ranked cities in each region, May 2026.

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SmogRank, most polluted cities in Mexico, PM2.5, May 2026, smogrank.com/mx/history/2026-05 (accessed 6 Oct 2026).

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