SmogRank / World / Mexico / April 2023

Most polluted cities in Mexico, April 2023

40 cities in Mexico ranked by their average PM2.5 over the 30 days. Worst: Tlaquepaque at 58.4 µg/m³, #7 of 1,567 cities in the world. Cleanest: Nogales at 9.8. A city needs measurements on 70% of the days to be ranked.

OpenAQ's archive, where our readings come from, has almost none for 3 of these 30 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.

About 2.24M people in these 17 cities breathed unhealthy air on an average day of April 2023.

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.

← Tlaquepaque 650K 600K0
Every city in Mexico ranked for April 2023 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. 1TlaquepaqueJalisco
    650K
  2. 2ZapopanJalisco
    422K
  3. 3MexicaliBaja California
    318K
  4. 4GuadalajaraJalisco
    231K
  5. 5Ciudad JuárezChihuahua
    224K
  6. 6CelayaGuanajuato
    202K
  7. 7AguascalientesAguascalientes
    86.7K
  8. 8MonterreyNuevo León
    42.1K
  9. 9Ciudad NezahualcoyotlMéxico
    41.4K
  10. 10Santa CatarinaNuevo León
    11.3K
  11. 11Pachuca de SotoHidalgo
    10.3K
  12. 12PueblaPuebla
    0
  13. 13Mexico CityMexico City
    0
  14. 14Santiago de QuerétaroQuerétaro
    0
  15. 15León de los AldamaGuanajuato
    0
  16. 16Victoria de DurangoDurango
    0
  17. 17Ciudad 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, April 2023 · Mexico now

Regions

Aguascalientes 1Baja California 2Chihuahua 1Durango 1Guanajuato 8Hidalgo 4Jalisco 3México 6Mexico City 1Morelos 1Nuevo León 7Puebla 1Querétaro 1Sonora 1

Ranked cities in each region, April 2023.

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SmogRank, most polluted cities in Mexico, PM2.5, April 2023, smogrank.com/mx/history/2023-04 (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.