SmogRank / World / Canada / Quebec / June 2025

Most polluted cities in Quebec, Canada, June 2025

17 cities in Quebec, Canada ranked by their average PM2.5 over the 30 days. Worst: Montréal at 12.9 µg/m³, #658 of 2,453 cities in the world. Cleanest: Sherbrooke at 8.6. 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 10% 7.5%0

Every city in Quebec, Canada ranked for June 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
10%
2Trois-Rivières
8%
3Granby
8%
4Montréal
7%
5Dorval
7%
6Sorel-Tracy
7%
7L'Ancienne-Lorette
7%
8Saguenay
7%
9Rivière-des-Prairies–Pointe-aux-Trembles
7%
10Brossard
7%
11Québec
7%
12Shawinigan
7%
13Bécancour
7%
14Sept-Îles
7%
15Drummondville
3%
16Saint-Jean-sur-Richelieu
3%
17Sherbrooke
0%

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, June 2025 · All cities in Canada, June 2025 · Quebec now

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SmogRank, most polluted cities in Quebec, Canada, PM2.5, June 2025, smogrank.com/ca/region/quebec/history/2025-06 (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.