SmogRank / World / Mexico / January 2026

Most polluted cities in Mexico, January 2026

40 cities in Mexico ranked by their average PM2.5 over the 31 days. Worst: Aguascalientes at 45.4 µg/m³, #58 of 2,593 cities in the world. Cleanest: Mérida at 8.5. 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.

← Tlaquepaque 58% 50%0
Every city in Mexico ranked for January 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. 1TlaquepaqueJalisco
    58%
  2. 2Hacienda Santa FeJalisco
    58%
  3. 3AguascalientesAguascalientes
    45%
  4. 4TijuanaBaja California
    42%
  5. 5XonacatlánMéxico
    36%
  6. 6GuadalajaraJalisco
    32%
  7. 7Zacatepec de HidalgoMorelos
    26%
  8. 8San Luis PotosíSan Luis Potosí
    17%
  9. 9La Providencia Siglo XXIHidalgo
    10%
  10. 10Silao de la VictoriaGuanajuato
    8%
  11. 11León de los AldamaGuanajuato
    8%
  12. 12Mexico CityMexico City
    8%
  13. 13AbasoloGuanajuato
    7%
  14. 14PueblaPuebla
    6%
  15. 15Ciudad General EscobedoNuevo León
    6%
  16. 16Santiago de QuerétaroQuerétaro
    6%
  17. 17TehuacánPuebla
    4%
  18. 18San Miguel de AllendeGuanajuato
    4%
  19. 19Naucalpan de JuárezMéxico
    4%
  20. 20Ciudad ApodacaNuevo León
    3%
  21. 21Heroica MatamorosTamaulipas
    3%
  22. 22San MarcosHidalgo
    3%
  23. 23ZapopanJalisco
    3%
  24. 24Ciudad JuárezChihuahua
    3%
  25. 25PesqueríaNuevo León
    3%
  26. 26MexicaliBaja California
    0%
  27. 27Parque Industrial Ciudad MitrasNuevo León
    0%
  28. 28San Martin Texmelucan de LabastidaPuebla
    0%
  29. 29Santa AnitaJalisco
    0%
  30. 30TlaxcalaTlaxcala
    0%
  31. 31CuernavacaMorelos
    0%
  32. 32Tetela del VolcánMorelos
    0%
  33. 33San Juan del RíoQuerétaro
    0%
  34. 34TulancingoHidalgo
    0%
  35. 35MonterreyNuevo León
    0%
  36. 36NogalesSonora
    0%
  37. 37GuanajuatoGuanajuato
    0%
  38. 38GarcíaNuevo León
    0%
  39. 39La PazBaja California Sur
    0%
  40. 40MéridaYucatán
    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, January 2026 · Mexico now

Regions

Aguascalientes 1Baja California 2Baja California Sur 1Chihuahua 1Guanajuato 5Hidalgo 3Jalisco 5México 2Mexico City 1Morelos 3Nuevo León 6Puebla 3Querétaro 2San Luis Potosí 1Sonora 1Tamaulipas 1Yucatán 1

Ranked cities in each region, January 2026.

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SmogRank, most polluted cities in Mexico, PM2.5, January 2026, smogrank.com/mx/history/2026-01 (accessed 7 Oct 2026).

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