SmogRank / World / Mexico / October 2026

Most polluted cities in Mexico, October 2026

33 cities in Mexico ranked by their average PM2.5 so far (1 of 31 days). Worst: San Luis Potosí at 34.5 µg/m³, #37 of 1,630 cities in the world. Cleanest: Tepic at 2.7. A city needs measurements on 70% of the days to be ranked.

← San Luis Potosí 34.5 µg/m³ 30 µg/m³0
Every city in Mexico ranked for October 2026, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1San Luis PotosíSan Luis Potosí
    98
  2. 2Naucalpan de JuárezMéxico
    89
  3. 3Mexico CityMexico City
    86
  4. 4Ciudad NezahualcoyotlMéxico
    81
  5. 5San Salvador TizatlalliMéxico
    74
  6. 6TijuanaBaja California
    73
  7. 7San Francisco TlalcilalcalpanMéxico
    72
  8. 8MexicaliBaja California
    68
  9. 9La Providencia Siglo XXIHidalgo
    62
  10. 10Hacienda Santa FeJalisco
    62
  11. 11PueblaPuebla
    59
  12. 12Santa CatarinaNuevo León
    59
  13. 13AguascalientesAguascalientes
    58
  14. 14Ciudad General EscobedoNuevo León
    57
  15. 15Ciudad Benito JuárezNuevo León
    56
  16. 16MonterreyNuevo León
    55
  17. 17TulancingoHidalgo
    55
  18. 17Pachuca de SotoHidalgo
    55
  19. 19CuernavacaMorelos
    54
  20. 20SalamancaGuanajuato
    54
  21. 20CelayaGuanajuato
    54
  22. 22Santa AnitaJalisco
    53
  23. 23GuadalajaraJalisco
    52
  24. 24León de los AldamaGuanajuato
    52
  25. 25IrapuatoGuanajuato
    52
  26. 26San Juan del RíoQuerétaro
    48
  27. 27ZapopanJalisco
    46
  28. 28Santiago de QuerétaroQuerétaro
    36
  29. 29Tula de AllendeHidalgo
    35
  30. 30Ciudad JuárezChihuahua
    27
  31. 31Zacatepec de HidalgoMorelos
    23
  32. 32San Miguel de AllendeGuanajuato
    22
  33. 33TepicNayarit
    15
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, October 2026 · Mexico now

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SmogRank, most polluted cities in Mexico, PM2.5, October 2026 (so far), smogrank.com/mx/history/2026-10 (accessed 2 Oct 2026).

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