SmogRank / World / Canada / Quebec / 2025

Most polluted cities in Quebec, Canada, 2025

16 cities in Quebec, Canada ranked by their average PM2.5 over the 365 days; 16 above the WHO annual guideline (5.0 µg/m³). Worst: Sorel-Tracy at 9.3 µg/m³, #1,195 of 2,624 cities in the world. Cleanest: Saint-Jean-sur-Richelieu at 5.5. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Rouyn-Noranda 3% 2%0

Every city in Quebec, Canada ranked for 2025, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.

1Rouyn-Noranda
3%
2L'Ancienne-Lorette
2%
3Granby
2%
4Trois-Rivières
2%
5Shawinigan
2%
6Dorval
2%
7Sorel-Tracy
2%
8Brossard
2%
9Québec
2%
10Montréal
2%
11Bécancour
1%
12Drummondville
1%
13Rivière-des-Prairies–Pointe-aux-Trembles
1%
14Sherbrooke
1%
15Saguenay
1%
16Saint-Jean-sur-Richelieu
1%

Good0–50

Moderate51–100

Sensitive groups101–150

Unhealthy151–200

Very unhealthy201–300

Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, 2025 · All cities in Canada, 2025 · Quebec now

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SmogRank, most polluted cities in Quebec, Canada, PM2.5, 2025, smogrank.com/ca/region/quebec/history/2025 (accessed 6 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.