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 476.6×
  2. 2AguascalientesAguascalientes, Mexico 466.4×
  3. 3TuxtlaChiapas, Mexico 446.1×
  4. 4San Luis PotosíSan Luis Potosí, Mexico 435.9×
  5. 5TlaquepaqueJalisco, Mexico 364.9×
  6. 6PueblaPuebla, Mexico 354.8×
  7. 7Naucalpan de JuárezMéxico, Mexico 334.5×
  8. 8Ciudad NezahualcoyotlMéxico, Mexico 324.4×
  9. 9CalexicoCalifornia, United States 314.3×
  10. 10GuadalajaraJalisco, Mexico 294.1×
  11. 11Mexico CityMexico City, Mexico 293.9×
  12. 12Pachuca de SotoHidalgo, Mexico 283.8×
  13. 13Mixquiahuala de JuárezHidalgo, Mexico 273.7×
  14. 14Zacatepec de HidalgoMorelos, Mexico 263.6×
  15. 15Santa AnitaJalisco, Mexico 263.6×
  16. 16CelayaGuanajuato, Mexico 263.5×
  17. 17Santa CatarinaNuevo León, Mexico 253.5×
  18. 18Ciudad General EscobedoNuevo León, Mexico 253.5×
  19. 19Parque Industrial Ciudad MitrasNuevo León, Mexico 253.4×
  20. 20IrapuatoGuanajuato, Mexico 243.3×
  21. 21Ciudad Benito JuárezNuevo León, Mexico 243.3×
  22. 22SalamancaGuanajuato, Mexico 243.3×
  23. 23León de los AldamaGuanajuato, Mexico 243.3×
  24. 24TehuacánPuebla, Mexico 233.2×
  25. 25Santiago de QuerétaroQuerétaro, Mexico 233.2×
All cities in the world
Excellent0–50
Good51–100
Lightly polluted101–150
Moderately polluted151–200
Heavily polluted201–300
Severely polluted301+

China's Air Quality Index (HJ 633-2012), PM2.5 individual index. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

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