SmogRank / World / Mexico / August 2023

Most people breathing unhealthy air in Mexico, August 2023

12 cities in Mexico measured at 2 or more places, ranked by how many people breathed unhealthy air on an average day over the 31 days. The most people breathing unhealthy air: Mexicali, Mexico, about 124K on an average day. A city needs measurements on 70% of the days to be ranked.

About 192K people in these 12 cities breathed unhealthy air on an average day of August 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.

← Mexicali 124K 100K0
Every city in Mexico ranked for August 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. 1MexicaliBaja California
    124K
  2. 2Victoria de DurangoDurango
    67.7K
  3. 3Santa CatarinaNuevo León
    0
  4. 4Ciudad JuárezChihuahua
    0
  5. 5CelayaGuanajuato
    0
  6. 6MonterreyNuevo León
    0
  7. 7GuadalajaraJalisco
    0
  8. 8Mexico CityMexico City
    0
  9. 9PueblaPuebla
    0
  10. 9León de los AldamaGuanajuato
    0
  11. 11Santiago de QuerétaroQuerétaro
    0
  12. 12Pachuca de SotoHidalgo
    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, August 2023 · Mexico now

Regions

Baja California 2Chihuahua 1Durango 1Guanajuato 7Hidalgo 5Jalisco 1México 5Mexico City 1Morelos 1Nuevo León 5Puebla 1Querétaro 1Sonora 1

Ranked cities in each region, August 2023.

Use this board

SmogRank, most polluted cities in Mexico, by people breathing unhealthy air, PM2.5, August 2023, smogrank.com/mx/history/2023-08?by=people (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.