SmogRank / Canada / Quebec / Trois-Rivières
Trois-Rivières, month by month
Trois-Rivières has a measured daily mean on 1,096 days since 5 January 2023. Its worst month was July 2025, at 65 US AQI (16.8 µg/m³), 296th of 2,889 cities on that month's world ranking. Its cleanest was April 2024, at 18 US AQI (3.2 µg/m³). 2025 averaged 41 US AQI (7.4 µg/m³), against 33 US AQI (6.0 µg/m³) in 2024.
Every month since 2023
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
10 months
| Month | Why |
|---|---|
| Oct 2023 | 5 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 15 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 15 with under 18 hours of readings or readings that failed our checks. |
| Jun 2023 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | 7 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | No day measured. The others: 3 missing from OpenAQ's archive, 27 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | No day measured. The others: 20 missing from OpenAQ's archive, 11 with under 18 hours of readings or readings that failed our checks. |
| Feb 2023 | 1 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 2 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 16 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 5 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Trois-Rivières's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2025 | 6516.8 µg/m³ | 296thof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 North-eastern United States and Canada, 24 to 28 July 2025and 1 more |
| June 2025 | 5712.3 µg/m³ | 756thof 2,508 | Northern United States and Canada, May and June 2025 |
| August 2025 | 529.8 µg/m³ | 1,278thof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| July 2026 | 529.8 µg/m³ | 1,413thof 2,784 | – |
| August 2024 | 519.1 µg/m³ | 845thof 2,010 | Eastern Canada and United States, August 2024 |
| December 2024 | 509.0 µg/m³ | 1,076thof 2,616 | South-eastern Canada and United States, December 2024 |
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.
Trois-Rivières's worst days
| Day | US AQI | Episode |
|---|---|---|
| 26 Jul 2025 | 16980.8 µg/m³ | North-eastern United States and Canada, 24 to 28 July 2025 |
| 6 Jun 2025 | 15256.3 µg/m³ | Northern United States and Canada, May and June 2025 |
| 25 Jul 2025 | 13750.3 µg/m³ | North-eastern United States and Canada, 24 to 28 July 2025 |
| 27 Dec 2024 | 12846.3 µg/m³ | South-eastern Canada and United States, December 2024 |
| 15 Jul 2025 | 12444.8 µg/m³ | Northern United States and Canada, July 2025 |
| 7 Jun 2025 | 11741.9 µg/m³ | Northern United States and Canada, May and June 2025 |
| 27 Jul 2025 | 10537.2 µg/m³ | North-eastern United States and Canada, 24 to 28 July 2025 |
| 3 Aug 2025 | 10537.2 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 28 Jan 2026 | 10135.7 µg/m³ | – |
| 26 Dec 2024 | 9734.0 µg/m³ | South-eastern Canada and United States, December 2024 |
Daily means, the highest since 5 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, Trois-Rivières, Canada, 5 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/trois-rivieres/history (accessed 13 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.
Trois-Rivières now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 01:07 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).