SmogRank / Castlegar / Swift Current

Castlegar vs Swift Current: PM2.5 compared

Over the last year, Castlegar's air was about 1.7× as polluted as Swift Current's: PM2.5 averaged 11.2 µg/m³ against 6.4, on the 311 days both cities were measured. Castlegar had the dirtier air on 230 of those days, Swift Current on 76. Castlegar was over the WHO's daily guideline of 15 µg/m³ on 38 of them, Swift Current on 21.

Right now

Castlegar#753on the 24-hour board of 1,970, at 46 US AQI (8.2 µg/m³)
Swift Current#917on the 24-hour board of 1,970, at 39 US AQI (7.0 µg/m³)

The last year, day by day

Castlegar
Swift Current
Each city's daily mean from 7 Oct 2025 to 6 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

Castlegar, Nov 2025: 9.2 µg/m³Swift Current, Nov 2025: 4.1 µg/m³Nov2025Castlegar, Dec 2025: 6.2 µg/m³Swift Current, Dec 2025: 5.3 µg/m³DecCastlegar, Jan 2026: 8.4 µg/m³Swift Current, Jan 2026: 4.8 µg/m³Jan2026Castlegar, Feb 2026: 6.1 µg/m³Swift Current, Feb 2026: 4.6 µg/m³FebCastlegar, Mar 2026: 5.9 µg/m³Swift Current, Mar 2026: 4.3 µg/m³MarCastlegar, Apr 2026: 6.6 µg/m³Swift Current, Apr 2026: 4.4 µg/m³AprCastlegar, May 2026: 5.9 µg/m³Swift Current, May 2026: 4.5 µg/m³MayCastlegar, Jun 2026: 4.5 µg/m³Swift Current, Jun 2026: 3.5 µg/m³JunCastlegar, Jul 2026: 19.7 µg/m³Swift Current, Jul 2026: 15.2 µg/m³JulCastlegar, Aug 2026: 39.3 µg/m³Swift Current, Aug 2026: 13.9 µg/m³AugCastlegar, Sep 2026: 8.0 µg/m³Swift Current, Sep 2026: 4.3 µg/m³SepOct
Monthly means in µg/m³ over the days both cities were measured. Solid: Castlegar. Faded: Swift Current. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

YearCastlegarSwift CurrentDays both measuredDays Castlegar was worse
2026 so far5739239175
20254247340193
20244142309172
20235763217105

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

Swift Current

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).

Swift Current

Side by side with Medicine Hat (the nearest), Gujranwala (the world's worst on 30 days).

Use this page

SmogRank, PM2.5 daily means compared, Castlegar and Swift Current, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/ca-castlegar/ca-swift-current (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.