SmogRank / World / Canada / Quebec / September 2024

Most polluted cities in Quebec, Canada, September 2024

16 cities in Quebec, Canada ranked by their average PM2.5 over the 30 days. Worst: Saguenay at 7.8 µg/m³, #871 of 1,964 cities in the world. Cleanest: Saint-Jean-sur-Richelieu at 4.9. 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.

← Saguenay 0% 0.75%0

Every city in Quebec, Canada ranked for September 2024, 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.

1Saguenay
0%
2Montréal
0%
3Shawinigan
0%
4Dorval
0%
4Rivière-des-Prairies–Pointe-aux-Trembles
0%
6Brossard
0%
7Sorel-Tracy
0%
8Québec
0%
9Bécancour
0%
10L'Ancienne-Lorette
0%
11Drummondville
0%
12Rouyn-Noranda
0%
13Granby
0%
13Sherbrooke
0%
13Trois-Rivières
0%
16Saint-Jean-sur-Richelieu
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, September 2024 · All cities in Canada, September 2024 · Quebec now

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SmogRank, most polluted cities in Quebec, Canada, PM2.5, September 2024, smogrank.com/ca/region/quebec/history/2024-09 (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.