SmogRank / Canada / New Brunswick / Moncton
Moncton, month by month
Moncton has a measured daily mean on 1,231 days since 1 January 2023. Its worst month was June 2023, at 48 US AQI (8.6 µg/m³), 1,008th of 1,603 cities on that month's world ranking. Its cleanest was November 2024, at 16 US AQI (2.9 µg/m³). 2025 averaged 25 US AQI (4.5 µg/m³), against 23 US AQI (4.1 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
5 months
| Month | Why |
|---|---|
| Jun 2025 | 16 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | 8 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Moncton's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 488.6 µg/m³ | 1,008thof 1,603 | Eastern United States and Canada, June and July 2023 |
| July 2023 | 427.6 µg/m³ | 908thof 1,432 | Eastern United States and Canada, June and July 2023 |
| July 2025 | 397.1 µg/m³ | 1,982ndof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| September 2023 | 386.8 µg/m³ | 1,574thof 2,176 | – |
| August 2025 | 376.6 µg/m³ | 2,326thof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| July 2026 | 366.5 µg/m³ | 2,293rdof 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.
Moncton's worst days
| Day | US AQI | Episode |
|---|---|---|
| 25 Jun 2023 | 8728.6 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 4 Aug 2025 | 8728.6 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 13 Jun 2023 | 7522.2 µg/m³ | – |
| 30 Jun 2026 | 7421.4 µg/m³ | – |
| 12 Jun 2023 | 7321.1 µg/m³ | – |
| 25 Aug 2025 | 7220.3 µg/m³ | – |
| 1 Oct 2023 | 7019.4 µg/m³ | – |
| 15 Jul 2026 | 7019.4 µg/m³ | – |
| 3 Aug 2025 | 6918.9 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 16 Jul 2025 | 6717.7 µg/m³ | – |
Daily means, the highest since 1 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, Moncton, Canada, 1 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/moncton/history (accessed 12 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.
Moncton now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 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).