SmogRank / Castlegar / Terrace
Castlegar vs Terrace: PM2.5 compared
Over the last year, Castlegar's air was about 2.4× as polluted as Terrace's: PM2.5 averaged 11.2 µg/m³ against 4.7, on the 316 days both cities were measured. Castlegar had the dirtier air on 231 of those days, Terrace on 84. Castlegar was over the WHO's daily guideline of 15 µg/m³ on 39 of them, Terrace on 1.
Right now
The last year, day by day
Month by month
Year by year
| Year | Castlegar | Terrace | Days Castlegar was worse |
|---|---|---|---|
| 2026 so far | 57 | 25 | 180 |
| 2025 | 42 | 27 | 229 |
| 2024 | 40 | 29 | 232 |
| 2023 | 54 | 33 | 185 |
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
Terrace
- 3 May 20266215.2 µg/m³
- 31 Dec 20256114.7 µg/m³
- 18 Oct 20256114.5 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).
Terrace
Side by side with Kitimat (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Castlegar and Terrace, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/ca-castlegar/ca-terrace (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.