SmogRank / Bécancour / Castlegar
Bécancour vs Castlegar: PM2.5 compared
Over the last year, Castlegar's air was about 1.9× as polluted as Bécancour's: PM2.5 averaged 11.2 µg/m³ against 5.8, on the 314 days both cities were measured. Castlegar had the dirtier air on 210 of those days, Bécancour on 104. Castlegar was over the WHO's daily guideline of 15 µg/m³ on 39 of them, Bécancour on 8.
Right now
The last year, day by day
Month by month
Year by year
| Year | Bécancour | Castlegar | Days Bécancour was worse |
|---|---|---|---|
| 2026 so far | 34 | 57 | 85 |
| 2025 | 40 | 42 | 142 |
| 2024 | 42 | 41 | 157 |
| 2023 | 41 | 54 | 93 |
Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.
Each city's worst days
Bécancour
- 28 Jan 20269231.0 µg/m³
- 3 Feb 20267722.9 µg/m³
- 29 Jan 20267622.7 µg/m³
Castlegar
- 11 Aug 2026227152.0 µg/m³
- 9 Aug 2026193116.0 µg/m³
- 7 Aug 2026187107.0 µg/m³
Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.
Compare either city with another
Bécancour
Side by side with Trois-Rivières (the nearest), Gujranwala (the world's worst on 30 days).
Castlegar
Side by side with Creston (the nearest), Edmonton (Canada's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Bécancour and Castlegar, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/ca-becancour/ca-castlegar (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.
The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.
Updated 2026-10-07 08:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.