SmogRank / Countries / Canada / Quebec

Most polluted cities in Quebec, Canada

16 measured cities, this year; 15 above the WHO annual guideline. Worst: L'Ancienne-Lorette at 8.3 µg/m³, #1,295 in the world.

16 good

  1. 1L'Ancienne-Lorette 8.31.7×
  2. 2Sorel-Tracy 7.81.6×
  3. 3Shawinigan 7.21.4×
  4. 4Brossard 6.91.4×
  5. 5Montréal 6.81.4×
  6. 6Québec 6.81.4×
  7. 7Drummondville 6.51.3×
  8. 8Granby 6.51.3×
  9. 9Trois-Rivières 6.51.3×
  10. 10Rivière-des-Prairies–Pointe-aux-Trembles 6.41.3×
  11. 11Gatineaulow-cost sensors 6.01.2×
  12. 12Sherbrooke 5.71.1×
  13. 13Saguenay 5.61.1×
  14. 14Saint-Jean-sur-Richelieu 5.41.1×
  15. 15Sept-Îles 5.21.0×
  16. 16Rouyn-Noranda 4.81.0×
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

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SmogRank, most polluted cities in Quebec, Canada, PM2.5, this year to 2 Oct 2026, 00:00 UTC, smogrank.com/ca/region/quebec?w=year.

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Updated 2026-10-02 00:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.