SmogRank / World / Mexico / August 2026

Most polluted cities in Mexico, August 2026

48 cities in Mexico ranked by their average PM2.5 over the 31 days. Worst: Mexicali at 29.4 µg/m³, #121 of 2,866 cities in the world. Cleanest: Tepic at 7.2. 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.

← Mérida 15% 10%0
Every city in Mexico ranked for August 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. 1MéridaYucatán
    15%
  2. 2MexicaliBaja California
    13%
  3. 3TuxtlaChiapas
    10%
  4. 4TijuanaBaja California
    8%
  5. 5San Luis PotosíSan Luis Potosí
    6%
  6. 6AguascalientesAguascalientes
    3%
  7. 7Hacienda Santa FeJalisco
    0%
  8. 8Ciudad NezahualcoyotlMéxico
    0%
  9. 8Parque Industrial Ciudad MitrasNuevo León
    0%
  10. 10AtlixcoPuebla
    0%
  11. 11Naucalpan de JuárezMéxico
    0%
  12. 12PueblaPuebla
    0%
  13. 13Santa CatarinaNuevo León
    0%
  14. 14Ciudad General EscobedoNuevo León
    0%
  15. 15GuadalajaraJalisco
    0%
  16. 16Silao de la VictoriaGuanajuato
    0%
  17. 17CelayaGuanajuato
    0%
  18. 18Mexico CityMexico City
    0%
  19. 19Atotonilco de TulaHidalgo
    0%
  20. 19SalamancaGuanajuato
    0%
  21. 21TlaquepaqueJalisco
    0%
  22. 22Ciudad ApodacaNuevo León
    0%
  23. 23León de los AldamaGuanajuato
    0%
  24. 24MonterreyNuevo León
    0%
  25. 25San Luis de la PazGuanajuato
    0%
  26. 26PesqueríaNuevo León
    0%
  27. 27Pachuca de SotoHidalgo
    0%
  28. 28TulancingoHidalgo
    0%
  29. 29Cadereyta JiménezNuevo León
    0%
  30. 29ZapopanJalisco
    0%
  31. 31Santiago de QuerétaroQuerétaro
    0%
  32. 31Ciudad Benito JuárezNuevo León
    0%
  33. 33TehuacánPuebla
    0%
  34. 33Mixquiahuala de JuárezHidalgo
    0%
  35. 35San Juan del RíoQuerétaro
    0%
  36. 35Heroica MatamorosTamaulipas
    0%
  37. 37San Miguel de AllendeGuanajuato
    0%
  38. 38CuernavacaMorelos
    0%
  39. 38IrapuatoGuanajuato
    0%
  40. 38Ciudad JuárezChihuahua
    0%
  41. 41Tula de AllendeHidalgo
    0%
  42. 42La Providencia Siglo XXIHidalgo
    0%
  43. 43Zacatepec de HidalgoMorelos
    0%
  44. 43GuanajuatoGuanajuato
    0%
  45. 45GarcíaNuevo León
    0%
  46. 46AbasoloGuanajuato
    0%
  47. 47NogalesSonora
    0%
  48. 48TepicNayarit
    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, August 2026 · Mexico now

Regions

Aguascalientes 1Baja California 2Chiapas 1Chihuahua 1Guanajuato 9Hidalgo 6Jalisco 4México 2Mexico City 1Morelos 2Nayarit 1Nuevo León 9Puebla 3Querétaro 2San Luis Potosí 1Sonora 1Tamaulipas 1Yucatán 1

Ranked cities in each region, August 2026.

Use this board

SmogRank, most polluted cities in Mexico, PM2.5, August 2026, smogrank.com/mx/history/2026-08 (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.