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.

About 0 people in these 14 cities breathed unhealthy air on an average day of October 2026.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

← Mexicali 0 0.750
Every city in Mexico ranked for October 2026 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1MexicaliBaja California
    0
  2. 2Mexico CityMexico City
    0
  3. 3Ciudad NezahualcoyotlMéxico
    0
  4. 4PueblaPuebla
    0
  5. 5AguascalientesAguascalientes
    0
  6. 6GuadalajaraJalisco
    0
  7. 7León de los AldamaGuanajuato
    0
  8. 8ZapopanJalisco
    0
  9. 9CelayaGuanajuato
    0
  10. 10MonterreyNuevo León
    0
  11. 11Ciudad General EscobedoNuevo León
    0
  12. 12Pachuca de SotoHidalgo
    0
  13. 13Santiago de QuerétaroQuerétaro
    0
  14. 14Ciudad JuárezChihuahua
    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 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.