SmogRank / World / Mexico / March 2026

Most polluted cities in Mexico, March 2026

45 cities in Mexico ranked by their average PM2.5 over the 31 days. Worst: Aguascalientes at 35.4 µg/m³, #185 of 2,947 cities in the world. Cleanest: Heroica Matamoros at 9.5. A city needs measurements on 70% of the days to be ranked.

About 1.06M people in these 15 cities breathed unhealthy air on an average day of March 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.

← Mexico City 397K 300K0
Every city in Mexico ranked for March 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. 1Mexico CityMexico City
    397K
  2. 2AguascalientesAguascalientes
    210K
  3. 3PueblaPuebla
    164K
  4. 4MexicaliBaja California
    99.9K
  5. 5TlaquepaqueJalisco
    83.9K
  6. 6Ciudad JuárezChihuahua
    48.8K
  7. 7GuadalajaraJalisco
    44.7K
  8. 8Pachuca de SotoHidalgo
    9.16K
  9. 9CelayaGuanajuato
    0
  10. 10Santiago de QuerétaroQuerétaro
    0
  11. 11Santa CatarinaNuevo León
    0
  12. 12León de los AldamaGuanajuato
    0
  13. 13MonterreyNuevo León
    0
  14. 14ZapopanJalisco
    0
  15. 14Ciudad General EscobedoNuevo León
    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, March 2026 · Mexico now

Regions

Aguascalientes 1Baja California 2Baja California Sur 1Chihuahua 1Guanajuato 7Hidalgo 7Jalisco 5México 2Mexico City 1Morelos 3Nuevo León 8Puebla 2Querétaro 2Sonora 1Tamaulipas 1

Ranked cities in each region, March 2026.

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SmogRank, most polluted cities in Mexico, PM2.5, March 2026, smogrank.com/mx/history/2026-03 (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.