SmogRank / Castlegar / Port Alberni
Castlegar vs Port Alberni: PM2.5 compared
Over the last year, Castlegar's air was about 1.7× as polluted as Port Alberni's: PM2.5 averaged 11.8 µg/m³ against 6.8, on the 274 days both cities were measured. Castlegar had the dirtier air on 152 of those days, Port Alberni on 119. Castlegar was over the WHO's daily guideline of 15 µg/m³ on 37 of them, Port Alberni on 6.
Right now
The last year, day by day
Month by month
Year by year
| Year | Castlegar | Port Alberni | Days Castlegar was worse |
|---|---|---|---|
| 2026 so far | 59 | 36 | 122 |
| 2025 | 43 | 39 | 159 |
| 2024 | 39 | 32 | 198 |
| 2023 | 54 | 34 | 161 |
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
Castlegar
- 11 Aug 2026227152.0 µg/m³
- 9 Aug 2026193116.0 µg/m³
- 7 Aug 2026187107.0 µg/m³
Port Alberni
- 6 Aug 20268326.5 µg/m³
- 7 Aug 20267622.6 µg/m³
- 5 Aug 20267220.5 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
Castlegar
Side by side with Creston (the nearest), Edmonton (Canada's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).
Port Alberni
Side by side with Courtenay (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Castlegar and Port Alberni, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/ca-castlegar/ca-port-alberni (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.