SmogRank / Castlegar / Grand Centre

Castlegar vs Grand Centre: PM2.5 compared

Over the last year, Castlegar's air was about 1.9× as polluted as Grand Centre's: PM2.5 averaged 11.0 µg/m³ against 5.8, on the 324 days both cities were measured. Castlegar had the dirtier air on 240 of those days, Grand Centre on 81. Castlegar was over the WHO's daily guideline of 15 µg/m³ on 39 of them, Grand Centre on 11.

Right now

Castlegar#770on the 24-hour board of 2,002, at 45 US AQI (8.1 µg/m³)
Grand Centre#1,966on the 24-hour board of 2,002, at 9 US AQI (1.6 µg/m³)

The last year, day by day

Castlegar
Grand Centre
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: 9.1 µg/m³Grand Centre, Nov 2025: 6.9 µg/m³Nov2025Castlegar, Dec 2025: 6.3 µg/m³Grand Centre, Dec 2025: 5.2 µg/m³DecCastlegar, Jan 2026: 8.4 µg/m³Grand Centre, Jan 2026: 7.0 µg/m³Jan2026Castlegar, Feb 2026: 6.1 µg/m³Grand Centre, Feb 2026: 5.1 µg/m³FebCastlegar, Mar 2026: 6.2 µg/m³Grand Centre, Mar 2026: 4.8 µg/m³MarCastlegar, Apr 2026: 6.5 µg/m³Grand Centre, Apr 2026: 4.0 µg/m³AprCastlegar, May 2026: 5.9 µg/m³Grand Centre, May 2026: 4.0 µg/m³MayCastlegar, Jun 2026: 4.5 µg/m³Grand Centre, Jun 2026: 4.1 µg/m³JunCastlegar, Jul 2026: 19.7 µg/m³Grand Centre, Jul 2026: 13.2 µg/m³JulCastlegar, Aug 2026: 39.3 µg/m³Grand Centre, Aug 2026: 7.8 µg/m³AugCastlegar, Sep 2026: 8.0 µg/m³Grand Centre, Sep 2026: 3.6 µg/m³SepOct
Monthly means in µg/m³ over the days both cities were measured. Solid: Castlegar. Faded: Grand Centre. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

YearCastlegarGrand CentreDays both measuredDays Castlegar was worse
2026 so far5733246181
20254254346175
20243954358189
20235468281108

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

Grand Centre

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).

Grand Centre

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

Use this page

SmogRank, PM2.5 daily means compared, Castlegar and Grand Centre, 7 Oct 2025 – 6 Oct 2026, smogrank.com/compare/ca-castlegar/ca-grand-centre (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.