SmogRank / Canada / Alberta / Edson
Edson, month by month
Edson has a measured daily mean on 1,306 days since 1 January 2023. Its worst month was May 2023, at 125 US AQI (45.1 µg/m³), 23rd of 1,600 cities on that month's world ranking. Its cleanest was October 2025, at 16 US AQI (2.8 µg/m³). 2025 averaged 41 US AQI (7.3 µg/m³), against 43 US AQI (7.7 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
2 months
| Month | Why |
|---|---|
| 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.
Edson's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| May 2023 | 12545.1 µg/m³ | 23rdof 1,600 | North-western United States and Canada, May 2023 North-western Canada and United States, May 2023and 1 more |
| June 2023 | 7622.3 µg/m³ | 228thof 1,603 | Alberta, Saskatchewan and British Columbia, Canada, June 2023 |
| September 2023 | 7119.7 µg/m³ | 103rdof 2,176 | Alberta, Saskatchewan and British Columbia, Canada, September 2023 Northern United States and Canada, August and September 2023 |
| September 2025 | 7019.3 µg/m³ | 232ndof 3,104 | North-western Canada and United States, September 2025 North-western United States and Canada, August and September 2025 |
| July 2023 | 6416.1 µg/m³ | 117thof 1,432 | Alberta, British Columbia and Saskatchewan, Canada, July 2023 Alberta and British Columbia, Canada, July 2023 |
| July 2024 | 6013.7 µg/m³ | 243rdof 2,566 | North-western United States and Canada, July 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.
Edson's worst days
| Day | US AQI | Episode |
|---|---|---|
| 21 May 2023 | 308229.0 µg/m³ | North-western United States and Canada, May 2023 |
| 20 May 2023 | 261186.0 µg/m³ | North-western United States and Canada, May 2023 |
| 11 May 2024 | 260185.0 µg/m³ | North-western Canada and United States, 11 to 12 May 2024 |
| 16 May 2023 | 237162.0 µg/m³ | Northern United States and Canada, May 2023 |
| 12 May 2024 | 191113.0 µg/m³ | North-western Canada and United States, 12 to 13 May 2024 North-western Canada and United States, 11 to 12 May 2024 |
| 17 May 2023 | 191112.0 µg/m³ | Northern United States and Canada, May 2023 |
| 18 May 2023 | 188108.0 µg/m³ | Northern United States and Canada, May 2023 |
| 5 May 2023 | 184103.0 µg/m³ | – |
| 17 Sept 2023 | 184103.0 µg/m³ | Alberta, Saskatchewan and British Columbia, Canada, September 2023 |
| 12 Jun 2023 | 17995.7 µg/m³ | Alberta, Saskatchewan and British Columbia, Canada, June 2023 |
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, Edson, 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/edson/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.
Edson now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 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).