SmogRank / Countries / Canada / Quebec

Most polluted cities in Quebec, Canada

17 measured cities, last 7 days; 0 above the WHO 24-hour guideline. Worst: Saint-Jean-sur-Richelieu at 7.0 µg/m³, #1,202 in the world.

17 good

  1. 1Saint-Jean-sur-Richelieu 7.0
  2. 2L'Ancienne-Lorette 6.4
  3. 3Brossard 6.2
  4. 4Montréal 6.1
  5. 5Québec 6.0
  6. 6Sept-Îles 5.8
  7. 7Shawinigan 5.8
  8. 8Sorel-Tracy 5.7
  9. 9Trois-Rivières 5.7
  10. 10Rivière-des-Prairies–Pointe-aux-Trembles 5.7
  11. 11Drummondville 5.1
  12. 12Saint-Georges 5.1
  13. 13Granby 5.0
  14. 14Rouyn-Noranda 5.0
  15. 15Saguenay 4.8
  16. 16Sherbrooke 4.1
  17. 17Gatineaulow-cost sensors 2.9
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Estimated: cities without a monitor

Quebec cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Laval≈ 7 µg/m³Good
Longueuil≈ 7 µg/m³Good
Rosemont–La Petite-Patrie≈ 7 µg/m³Good
Villeray–Saint-Michel–Parc-Extension≈ 7 µg/m³Good
Lévis≈ 8 µg/m³Good
Mercier–Hochelaga-Maisonneuve≈ 7 µg/m³Good
Saint-Louis-de-Terrebonne≈ 7 µg/m³Good
Terrebonne≈ 7 µg/m³Good
Le Plateau-Mont-Royal≈ 7 µg/m³Good
Ville-Marie≈ 7 µg/m³Good
Montréal-Nord≈ 7 µg/m³Good
Le Sud-Ouest≈ 7 µg/m³Good
Repentigny≈ 7 µg/m³Good
Pierrefonds-Roxboro≈ 5 µg/m³Good
Pierrefonds≈ 5 µg/m³Good
Aylmer≈ 5 µg/m³Good
Saint-Michel≈ 7 µg/m³Good
Saint-Jérôme≈ 5 µg/m³Good
Saint-Hyacinthe≈ 5 µg/m³Good
Dollard-Des Ormeaux≈ 5 µg/m³Good
Blainville≈ 5 µg/m³Good
Salaberry-de-Valleyfield≈ 5 µg/m³Good
Châteauguay≈ 6 µg/m³Good
Rimouski≈ 5 µg/m³Good
Saint-Eustache≈ 5 µg/m³Good
Val-des-Arbres≈ 7 µg/m³Good
Boucherville≈ 7 µg/m³Good
Neufchâtel-Est–Lebourgneuf≈ 8 µg/m³Good
Laval-des-Rapides≈ 7 µg/m³Good
Joliette≈ 4 µg/m³Good
Cartierville≈ 7 µg/m³Good
Mascouche≈ 7 µg/m³Good
Mirabel≈ 5 µg/m³Good
Victoriaville≈ 4 µg/m³Good
Côte-Saint-Luc≈ 7 µg/m³Good
Pointe-Claire≈ 5 µg/m³Good
Alma≈ 4 µg/m³Good
Sainte-Julie≈ 7 µg/m³Good
Saint-Constant≈ 6 µg/m³Good
Boisbriand≈ 5 µg/m³Good

Updated 2026-10-01 17:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.