SmogRank / World / Mexico / May 2025

Most unhealthy days in Mexico, May 2025

46 cities in Mexico ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Cholula, Mexico, 13 of 29 measured days. 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.

← Cholula 45% 40%0
Every city in Mexico ranked for May 2025, 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. 1CholulaPuebla
    13 of 29
  2. 2Hacienda Santa FeJalisco
    11 of 31
  3. 3Victoria de DurangoDurango
    7 of 26
  4. 4Ciudad Benito JuárezNuevo León
    4 of 29
  5. 5IrapuatoGuanajuato
    3 of 23
  6. 6AguascalientesAguascalientes
    4 of 31
  7. 7TlaquepaqueJalisco
    3 of 31
  8. 8Atotonilco de TulaHidalgo
    3 of 31
  9. 9TehuacánPuebla
    3 of 31
  10. 10MonterreyNuevo León
    3 of 31
  11. 11San Luis PotosíSan Luis Potosí
    2 of 28
  12. 12Mixquiahuala de JuárezHidalgo
    2 of 31
  13. 13Ciudad JuárezChihuahua
    2 of 31
  14. 14León de los AldamaGuanajuato
    1 of 24
  15. 15MéridaYucatán
    1 of 24
  16. 16Cadereyta JiménezNuevo León
    1 of 28
  17. 17San Martin Texmelucan de LabastidaPuebla
    1 of 30
  18. 18PueblaPuebla
    1 of 31
  19. 19TlaxcoapanHidalgo
    1 of 31
  20. 20TulancingoHidalgo
    1 of 31
  21. 21Naucalpan de JuárezMéxico
    0 of 27
  22. 22Ciudad NezahualcoyotlMéxico
    0 of 22
  23. 23Tepeji del Río de OcampoHidalgo
    0 of 30
  24. 24Mexico CityMexico City
    0 of 27
  25. 25GuadalajaraJalisco
    0 of 28
  26. 26Santiago de QuerétaroQuerétaro
    0 of 31
  27. 27TlaxcalaTlaxcala
    0 of 29
  28. 28SalamancaGuanajuato
    0 of 25
  29. 29TepicNayarit
    0 of 31
  30. 30Ciudad General EscobedoNuevo León
    0 of 27
  31. 31San Juan del RíoQuerétaro
    0 of 30
  32. 32CelayaGuanajuato
    0 of 26
  33. 33Pachuca de SotoHidalgo
    0 of 25
  34. 34San Miguel de AllendeGuanajuato
    0 of 25
  35. 35Santa AnitaJalisco
    0 of 29
  36. 36San MarcosHidalgo
    0 of 31
  37. 37AbasoloGuanajuato
    0 of 24
  38. 38ZapopanJalisco
    0 of 31
  39. 39La Providencia Siglo XXIHidalgo
    0 of 31
  40. 40MexicaliBaja California
    0 of 31
  41. 41Heroica MatamorosTamaulipas
    0 of 29
  42. 42Zacatepec de HidalgoMorelos
    0 of 31
  43. 43TijuanaBaja California
    0 of 31
  44. 44La PazBaja California Sur
    0 of 27
  45. 45NogalesSonora
    0 of 31
  46. 46ChihuahuaChihuahua
    0 of 29
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 2025 · Mexico now

Regions

Aguascalientes 1Baja California 2Baja California Sur 1Chihuahua 2Durango 1Guanajuato 6Hidalgo 8Jalisco 5México 2Mexico City 1Morelos 1Nayarit 1Nuevo León 4Puebla 4Querétaro 2San Luis Potosí 1Sonora 1Tamaulipas 1Yucatán 1

Ranked cities in each region, May 2025.

Use this board

SmogRank, most polluted cities in Mexico, by unhealthy days, PM2.5, May 2025, smogrank.com/mx/history/2025-05?by=days (accessed 7 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.