SmogRank / World / Canada / British Columbia / September 2025
Most polluted cities in British Columbia, Canada, September 2025
39 cities in British Columbia, Canada ranked by their average PM2.5 over the 30 days. Worst: Williams Lake at 23.5 µg/m³, #156 of 3,052 cities in the world. Cleanest: Harewood at 5.0. 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.
- 1Williams Lake 29%
- 2Prince George 27%
- 3Quesnel 20%
- 4Castlegar 13%
- 5Cranbrook 13%
- 6Squamish 13%
- 7Fort St. John 13%
- 8Gibsons 10%
- 9Whistler 10%
- 10Agassiz 7%
- 11Creston 7%
- 12Vernon 7%
- 13Kelowna 7%
- 14Hope 7%
- 15Smithers 7%
- 16West Vancouver 3%
- 17Coquitlam 3%
- 18Burnaby 3%
- 19Kamloops 0%
- 20Chilliwack 0%
- 21Mission 0%
- 22Abbotsford 0%
- 23Vancouver 0%
- 24North Vancouver 0%
- 24Port Coquitlam 0%
- 26Langley 0%
- 27Strawberry Hill 0%
- 28Port Alberni 0%
- 29Nanaimo 0%
- 30Duncan 0%
- 30Richmond 0%
- 32Victoria 0%
- 33Terrace 0%
- 34Delta 0%
- 34Langford 0%
- 36North Cowichan 0%
- 37Kitimat 0%
- 38Campbell River 0%
- 38Harewood 0%
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
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SmogRank, most polluted cities in British Columbia, Canada, PM2.5, September 2025, smogrank.com/ca/region/british-columbia/history/2025-09 (accessed 7 Oct 2026).
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.