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 WHO annual guideline
Every measured city in North America, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.

Countries

CountryCitiesMedianCities by bandWorst city
Mexico4216.6 Hacienda Santa Fe 32.9
Honduras113.8 San Pedro Sula 13.8
United States6527.7 Calexico 21.6
Canada936.6 Kamloops 13.8

Worst cities

  1. 1Hacienda Santa FeJalisco, Mexico 32.96.6×
  2. 2AguascalientesAguascalientes, Mexico 32.06.4×
  3. 3TuxtlaChiapas, Mexico 30.36.1×
  4. 4San Luis PotosíSan Luis Potosí, Mexico 29.45.9×
  5. 5TlaquepaqueJalisco, Mexico 24.74.9×
  6. 6PueblaPuebla, Mexico 24.14.8×
  7. 7Naucalpan de JuárezMéxico, Mexico 22.44.5×
  8. 8Ciudad NezahualcoyotlMéxico, Mexico 22.14.4×
  9. 9CalexicoCalifornia, United States 21.64.3×
  10. 10GuadalajaraJalisco, Mexico 20.34.1×
  11. 11Mexico CityMexico City, Mexico 19.63.9×
  12. 12Pachuca de SotoHidalgo, Mexico 19.23.8×
  13. 13Mixquiahuala de JuárezHidalgo, Mexico 18.63.7×
  14. 14Zacatepec de HidalgoMorelos, Mexico 18.33.7×
  15. 15Santa AnitaJalisco, Mexico 17.83.6×
  16. 16CelayaGuanajuato, Mexico 17.83.6×
  17. 17Santa CatarinaNuevo León, Mexico 17.53.5×
  18. 18Ciudad General EscobedoNuevo León, Mexico 17.43.5×
  19. 19Parque Industrial Ciudad MitrasNuevo León, Mexico 17.03.4×
  20. 20IrapuatoGuanajuato, Mexico 16.73.3×
  21. 21SalamancaGuanajuato, Mexico 16.63.3×
  22. 22Ciudad Benito JuárezNuevo León, Mexico 16.63.3×
  23. 23León de los AldamaGuanajuato, Mexico 16.53.3×
  24. 24TehuacánPuebla, Mexico 16.13.2×
  25. 25Santiago de QuerétaroQuerétaro, Mexico 16.03.2×
All cities in the world
Good0–5
Fair6–15
Moderate16–50
Poor51–90
Very poor91–140
Extremely poor141+

The European Environment Agency's air quality index bands for PM2.5 (2024 revision); it has bands, not numbers, so values stay in µg/m³. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors in µg/m³.