SmogRank / Canada / Quebec / Rouyn-Noranda

Rouyn-Noranda, month by month

Rouyn-Noranda has a measured daily mean on 1,255 days since 20 January 2023. Its worst month was June 2023, at 158 US AQI (64.9 µg/m³), 7th of 1,603 cities on that month's world ranking. Its cleanest was May 2026, at 13 US AQI (2.3 µg/m³). 2025 averaged 34 US AQI (6.2 µg/m³), against 25 US AQI (4.5 µg/m³) in 2024.

Every month since 2023

202626 so far279 days measured2,677th of 2,791 in the world
Jan27#2,354Feb26#2,634Mar19#2,869Apr14#2,911May13#2,855Jun34#1,850Jul53#1,280Aug28#2,731Sep22#2,768Oct13#2,707
202534 for the year343 days measured2,313th of 2,681 in the world
Jan30#2,142Feb26#2,450Mar22#2,677Apr21#2,834May19#2,692Jun57#756Jul64#341Aug58#633Sep22#2,940Oct17#2,564Nov13#2,698Dec18#2,930
202425 for the year350 days measured2,005th of 2,097 in the world
Jan19#2,314Feb27#2,173Mar16#1,637Apr14#2,479May21#2,478Jun32#2,112Jul49#1,046Aug19 daysSep32#1,562Oct19#1,975Nov13#2,605Dec17#2,552
202358 for the year283 days measured184th of 1,355 in the world
Jan11 daysFeb3 daysMar11 daysApr27#1,380May32#1,342Jun158#7Jul21 daysAug56#355Sep44#1,121Oct24#1,886Nov23#2,114Dec22#2,138
Each square is a month's mean PM2.5 in US AQI from Rouyn-Noranda's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Rouyn-Noranda marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Months without a mean, and why

5 months
MonthWhy
Aug 202419 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jul 202321 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 9 with under 18 hours of readings or readings that failed our checks.
Mar 202311 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 20233 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive.
Jan 202311 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Rouyn-Noranda's worst months

MonthUS AQIDays measuredWorld rankEpisode
June 2023 15864.9 µg/m³29 of 307thof 1,603Eastern United States and Canada, June and July 2023
United States and Canada, June 2023and 1 more
July 2025 6415.9 µg/m³29 of 31341stof 2,889North-eastern United States and Canada, 29 July to 9 August 2025
North-eastern United States and Canada, 24 to 28 July 2025and 1 more
August 2025 5812.7 µg/m³23 of 31633rdof 2,901North-eastern United States and Canada, 29 July to 9 August 2025
June 2025 5712.3 µg/m³30 of 30756thof 2,508Northern United States and Canada, May and June 2025
August 2023 5611.9 µg/m³31 of 31355thof 1,980–
July 2026 5310.3 µg/m³31 of 311,280thof 2,784–

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Rouyn-Noranda's worst days

DayUS AQIEpisode
26 Jun 2023 473312.0 µg/m³Eastern United States and Canada, June and July 2023
25 Jun 2023 296221.0 µg/m³Eastern United States and Canada, June and July 2023
27 Jun 2023 294219.0 µg/m³Eastern United States and Canada, June and July 2023
4 Jun 2023 293218.0 µg/m³Eastern United States and Canada, May and June 2023
3 Jun 2023 258183.0 µg/m³Eastern United States and Canada, May and June 2023
2 Aug 2025 17387.3 µg/m³North-eastern United States and Canada, 29 July to 9 August 2025
24 Jun 2023 17387.0 µg/m³–
9 Jun 2023 16067.7 µg/m³Eastern United States and Canada, May and June 2023
11 Jul 2026 15358.3 µg/m³–
13 Jul 2025 15155.5 µg/m³Northern United States and Canada, July 2025

Daily means, the highest since 20 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Rouyn-Noranda, Canada, 20 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ca/rouyn-noranda/history (accessed 12 Oct 2026).

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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.

Rouyn-Noranda now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).