Castlegar vs Drummondville: PM2.5 compared

Over the last year, Castlegar's air was about 1.8× as polluted as Drummondville's: PM2.5 averaged 11.1 µg/m³ against 6.1, on the 320 days both cities were measured. Castlegar had the dirtier air on 200 of those days, Drummondville on 117. Castlegar was over the WHO's daily guideline of 15 µg/m³ on 39 of them, Drummondville on 13.

Right now

Castlegar#770on the 24-hour board of 2,002, at 45 US AQI (8.1 µg/m³)

Drummondville#1,825on the 24-hour board of 2,002, at 16 US AQI (2.9 µg/m³)

The last year, day by day

Castlegar

Drummondville

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

Monthly means in µg/m³ over the days both cities were measured. Solid: Castlegar. Faded: Drummondville. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Castlegar	Drummondville	Days both measured	Days Castlegar was worse
2026 so far	57	35	243	148
2025	42	38	341	196
2024	39	34	355	201
2023	54	49	283	142

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

Drummondville

28 Jan 20268627.8 µg/m³
8 Jan 20268427.0 µg/m³
6 Jan 20267723.2 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).

Drummondville

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

Use this page

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