SmogRank / World / Mexico / October 2026

Most polluted cities in Mexico, October 2026

35 cities in Mexico ranked by their average PM2.5 so far (5 of 31 days). Worst: Tijuana at 21.4 µg/m³, #79 of 2,246 cities in the world. Cleanest: San Miguel de Allende at 4.1. 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.

← Tijuana 0% 0.75%0
Every city in Mexico ranked for October 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. 1TijuanaBaja California
    0%
  2. 2Hacienda Santa FeJalisco
    0%
  3. 3MexicaliBaja California
    0%
  4. 4Naucalpan de JuárezMéxico
    0%
  5. 5Mexico CityMexico City
    0%
  6. 6Ciudad NezahualcoyotlMéxico
    0%
  7. 7PueblaPuebla
    0%
  8. 8Santa AnitaJalisco
    0%
  9. 9AguascalientesAguascalientes
    0%
  10. 10Atotonilco de TulaHidalgo
    0%
  11. 11GuadalajaraJalisco
    0%
  12. 12SalamancaGuanajuato
    0%
  13. 13CuernavacaMorelos
    0%
  14. 13IrapuatoGuanajuato
    0%
  15. 15León de los AldamaGuanajuato
    0%
  16. 16ZapopanJalisco
    0%
  17. 17CelayaGuanajuato
    0%
  18. 18La Providencia Siglo XXIHidalgo
    0%
  19. 19MonterreyNuevo León
    0%
  20. 20Ciudad General EscobedoNuevo León
    0%
  21. 21Zacatepec de HidalgoMorelos
    0%
  22. 21TulancingoHidalgo
    0%
  23. 23Mixquiahuala de JuárezHidalgo
    0%
  24. 24Pachuca de SotoHidalgo
    0%
  25. 25Cadereyta JiménezNuevo León
    0%
  26. 26San Luis de la PazGuanajuato
    0%
  27. 27San Juan del RíoQuerétaro
    0%
  28. 27PesqueríaNuevo León
    0%
  29. 29NogalesSonora
    0%
  30. 30Santiago de QuerétaroQuerétaro
    0%
  31. 31Ciudad JuárezChihuahua
    0%
  32. 32Tula de AllendeHidalgo
    0%
  33. 32GuanajuatoGuanajuato
    0%
  34. 34AbasoloGuanajuato
    0%
  35. 35San Miguel de AllendeGuanajuato
    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, October 2026 · Mexico now

Regions

Aguascalientes 1Baja California 2Chihuahua 1Guanajuato 8Hidalgo 6Jalisco 4México 2Mexico City 1Morelos 2Nuevo León 4Puebla 1Querétaro 2Sonora 1

Ranked cities in each region, October 2026.

Use this board

SmogRank, most polluted cities in Mexico, PM2.5, October 2026 (so far), smogrank.com/mx/history/2026-10 (accessed 6 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.