SmogRank / World / Mexico / August 2025

Most unhealthy days in Mexico, August 2025

34 cities in Mexico ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Tuxtla, Mexico, 1 of 22 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.

← Tuxtla 5% 4%0
Every city in Mexico ranked for August 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. 1TuxtlaChiapas
    1 of 22
  2. 2CholulaPuebla
    1 of 23
  3. 3Atotonilco de TulaHidalgo
    1 of 25
  4. 4San Antonio la IslaMéxico
    1 of 28
  5. 5XonacatlánMéxico
    1 of 31
  6. 6MexicaliBaja California
    1 of 31
  7. 7Tepeji del Río de OcampoHidalgo
    0 of 28
  8. 8TijuanaBaja California
    0 of 31
  9. 9Naucalpan de JuárezMéxico
    0 of 24
  10. 10Ciudad Benito JuárezNuevo León
    0 of 27
  11. 11MonterreyNuevo León
    0 of 27
  12. 12Mexico CityMexico City
    0 of 30
  13. 13PueblaPuebla
    0 of 31
  14. 14TlaquepaqueJalisco
    0 of 31
  15. 15Ciudad JuárezChihuahua
    0 of 31
  16. 16MéridaYucatán
    0 of 23
  17. 17San MarcosHidalgo
    0 of 25
  18. 18San Martin Texmelucan de LabastidaPuebla
    0 of 26
  19. 19TulancingoHidalgo
    0 of 31
  20. 20AguascalientesAguascalientes
    0 of 31
  21. 21TehuacánPuebla
    0 of 31
  22. 22Santiago de QuerétaroQuerétaro
    0 of 31
  23. 23Mixquiahuala de JuárezHidalgo
    0 of 31
  24. 24ZapopanJalisco
    0 of 26
  25. 25San Juan del RíoQuerétaro
    0 of 31
  26. 26NogalesSonora
    0 of 31
  27. 27HuichapanHidalgo
    0 of 27
  28. 28TepicNayarit
    0 of 29
  29. 29ChihuahuaChihuahua
    0 of 26
  30. 30Heroica MatamorosTamaulipas
    0 of 29
  31. 30La PazBaja California Sur
    0 of 28
  32. 32Zacatepec de HidalgoMorelos
    0 of 25
  33. 33Pachuca de SotoHidalgo
    0 of 30
  34. 34Victoria de DurangoDurango
    0 of 28
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 2025 · Mexico now

Regions

Aguascalientes 1Baja California 2Baja California Sur 1Chiapas 1Chihuahua 2Durango 1Hidalgo 7Jalisco 2México 3Mexico City 1Morelos 1Nayarit 1Nuevo León 2Puebla 4Querétaro 2Sonora 1Tamaulipas 1Yucatán 1

Ranked cities in each region, August 2025.

Use this board

SmogRank, most polluted cities in Mexico, by unhealthy days, PM2.5, August 2025, smogrank.com/mx/history/2025-08?by=days (accessed 7 Oct 2026).

Download top 10 by average (PNG)

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.