SmogRank / World / North America

Most polluted cities in North America

704 of 788 measured cities in 4 countries were above the WHO annual guideline so far this year. The worst was Hacienda Santa Fe, Mexico, at 32.9 µg/m³.

VenezuelaU.S. Virgin IslandsPuerto RicoUnited States: 652 measured citiesAnguillaCayman IslandsBermudaBritish Virgin IslandsTurks and Caicos IslandsTrinidad and TobagoSurinameSaint Vincent and the GrenadinesSaint LuciaSaint Kitts and NevisRussiaPanamaNicaraguaArubaCuracaoMexico: 42 measured citiesJamaicaHonduras: 1 measured cityHaitiGuyanaGuatemalaGrenadaFrance: 100 measured citiesSaint Pierre and MiquelonSaint MartinEl SalvadorDominican RepublicDominicaGreenlandCubaCosta RicaColombiaCanada: 93 measured citiesBrazil: 5 measured citiesBelizeBarbadosBahamasAntigua and BarbudaSint Maarten
Each dot is a measured city, coloured by its PM2.5 so far this year; tap a country to open it.
← Hacienda Santa Fe 32.9 µg/m³ 30 µg/m³5 WHO annual guideline
Every measured city in North America, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.

Countries

CountryCitiesMedianCities by bandWorst city
Mexico4216.5 Hacienda Santa Fe 32.9
Honduras113.9 San Pedro Sula 13.9
United States6527.7 Calexico 21.6
Canada936.6 Kamloops 13.8

Worst cities

  1. 1Hacienda Santa FeJalisco, Mexico 956.6×
  2. 2AguascalientesAguascalientes, Mexico 936.4×
  3. 3TuxtlaChiapas, Mexico 906.1×
  4. 4San Luis PotosíSan Luis Potosí, Mexico 895.9×
  5. 5TlaquepaqueJalisco, Mexico 804.9×
  6. 6PueblaPuebla, Mexico 794.8×
  7. 7Naucalpan de JuárezMéxico, Mexico 764.5×
  8. 8Ciudad NezahualcoyotlMéxico, Mexico 754.4×
  9. 9CalexicoCalifornia, United States 744.3×
  10. 10GuadalajaraJalisco, Mexico 724.1×
  11. 11Mexico CityMexico City, Mexico 713.9×
  12. 12Pachuca de SotoHidalgo, Mexico 703.8×
  13. 13Mixquiahuala de JuárezHidalgo, Mexico 693.7×
  14. 14Zacatepec de HidalgoMorelos, Mexico 683.6×
  15. 15Santa AnitaJalisco, Mexico 673.6×
  16. 16CelayaGuanajuato, Mexico 673.5×
  17. 17Santa CatarinaNuevo León, Mexico 673.5×
  18. 18Ciudad General EscobedoNuevo León, Mexico 663.5×
  19. 19Parque Industrial Ciudad MitrasNuevo León, Mexico 663.4×
  20. 20IrapuatoGuanajuato, Mexico 653.3×
  21. 21Ciudad Benito JuárezNuevo León, Mexico 653.3×
  22. 22SalamancaGuanajuato, Mexico 653.3×
  23. 23León de los AldamaGuanajuato, Mexico 653.3×
  24. 24TehuacánPuebla, Mexico 643.2×
  25. 25Santiago de QuerétaroQuerétaro, Mexico 643.2×
All cities in the world
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

Updated 2026-10-02 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.