SmogRank / World / Mexico / February 2026

Most polluted cities in Mexico, February 2026

38 cities in Mexico ranked by their average PM2.5 over the 28 days. Worst: Aguascalientes at 35.9 µg/m³, #183 of 2,841 cities in the world. Cleanest: Mérida at 10.1. A city needs measurements on 70% of the days to be ranked.

About 1.45M people in these 13 cities breathed unhealthy air on an average day of February 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 439K 400K0
Every city in Mexico ranked for February 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
    439K
  2. 2AguascalientesAguascalientes
    335K
  3. 3MexicaliBaja California
    207K
  4. 4TlaquepaqueJalisco
    139K
  5. 5PueblaPuebla
    121K
  6. 6Ciudad JuárezChihuahua
    108K
  7. 7GuadalajaraJalisco
    99K
  8. 8Pachuca de SotoHidalgo
    0
  9. 9Santiago de QuerétaroQuerétaro
    0
  10. 10Santa CatarinaNuevo León
    0
  11. 11Ciudad General EscobedoNuevo León
    0
  12. 12MonterreyNuevo León
    0
  13. 13ZapopanJalisco
    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, February 2026 · Mexico now

Regions

Aguascalientes 1Baja California 2Baja California Sur 1Chihuahua 1Coahuila 1Hidalgo 4Jalisco 5México 2Mexico City 1Morelos 2Nuevo León 8Puebla 3Querétaro 2San Luis Potosí 1Sonora 1Tamaulipas 1Yucatán 1

Ranked cities in each region, February 2026.

Use this board

SmogRank, most polluted cities in Mexico, PM2.5, February 2026, smogrank.com/mx/history/2026-02 (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.