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 546.6×
  2. 2AguascalientesAguascalientes, Mexico 536.4×
  3. 3TuxtlaChiapas, Mexico 506.1×
  4. 4San Luis PotosíSan Luis Potosí, Mexico 505.9×
  5. 5TlaquepaqueJalisco, Mexico 424.9×
  6. 6PueblaPuebla, Mexico 404.8×
  7. 7Naucalpan de JuárezMéxico, Mexico 384.5×
  8. 8Ciudad NezahualcoyotlMéxico, Mexico 374.4×
  9. 9CalexicoCalifornia, United States 374.3×
  10. 10GuadalajaraJalisco, Mexico 334.1×
  11. 11Mexico CityMexico City, Mexico 333.9×
  12. 12Pachuca de SotoHidalgo, Mexico 323.8×
  13. 13Mixquiahuala de JuárezHidalgo, Mexico 323.7×
  14. 14Zacatepec de HidalgoMorelos, Mexico 303.6×
  15. 15Santa AnitaJalisco, Mexico 303.6×
  16. 16CelayaGuanajuato, Mexico 303.5×
  17. 17Santa CatarinaNuevo León, Mexico 303.5×
  18. 18Ciudad General EscobedoNuevo León, Mexico 283.5×
  19. 19Parque Industrial Ciudad MitrasNuevo León, Mexico 283.4×
  20. 20IrapuatoGuanajuato, Mexico 283.3×
  21. 21Ciudad Benito JuárezNuevo León, Mexico 283.3×
  22. 22SalamancaGuanajuato, Mexico 283.3×
  23. 23León de los AldamaGuanajuato, Mexico 283.3×
  24. 24TehuacánPuebla, Mexico 273.2×
  25. 25Santiago de QuerétaroQuerétaro, Mexico 273.2×
All cities in the world
Good0–50
Satisfactory51–100
Moderate101–200
Poor201–300
Very poor301–400
Severe401+

India's National Air Quality Index (CPCB), PM2.5 sub-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 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the India AQI PM2.5 sub-index.