SmogRank / France / Île-de-France / Beaumont-sur-Oise
Beaumont-sur-Oise, month by month
Beaumont-sur-Oise has a measured daily mean on 932 days since 6 May 2023. Its worst month was February 2025, at 62 US AQI (15.2 µg/m³), 855th of 2,633 cities on that month's world ranking. Its cleanest was September 2025, at 22 US AQI (4.0 µg/m³).
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
12 months
| Month | Why |
|---|---|
| Jun 2026 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 19 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 9 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Jul 2024 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Jun 2024 | 2 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| May 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | 2 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 20 of 31 days measured; a month needs 22. The others: 11 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.
Beaumont-sur-Oise's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 6215.2 µg/m³ | 855thof 2,633 | Europe, 14 February to 1 March 2025 |
| March 2026 | 5813.0 µg/m³ | 1,064thof 2,971 | Europe, 18 to 25 March 2026 Europe, 1 to 12 March 2026 |
| March 2025 | 5611.8 µg/m³ | 1,266thof 2,862 | Europe, March 2025 Germany, Poland and 25 more countries, March 2025and 1 more |
| January 2024 | 5410.9 µg/m³ | 798thof 2,385 | Western Europe, January 2024 |
| January 2025 | 5410.9 µg/m³ | 848thof 2,474 | Germany, France and 19 more countries, January 2025 |
| December 2025 | 529.7 µg/m³ | 1,404thof 3,006 | – |
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.
Beaumont-sur-Oise's worst days
| Day | US AQI | Episode |
|---|---|---|
| 7 Mar 2026 | 10537.1 µg/m³ | Europe, 1 to 12 March 2026 |
| 8 Mar 2026 | 9633.3 µg/m³ | Europe, 1 to 12 March 2026 |
| 23 Mar 2026 | 9331.9 µg/m³ | Europe, 18 to 25 March 2026 |
| 14 Feb 2025 | 9231.3 µg/m³ | Europe, 14 February to 1 March 2025 |
| 25 Mar 2025 | 9030.3 µg/m³ | Europe, March 2025 |
| 19 Feb 2025 | 8627.9 µg/m³ | Europe, 14 February to 1 March 2025 |
| 19 Jan 2025 | 8527.5 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 21 Mar 2026 | 8527.4 µg/m³ | Europe, 18 to 25 March 2026 |
| 11 Mar 2025 | 8426.7 µg/m³ | Germany, Poland and 25 more countries, March 2025 |
| 20 Jan 2025 | 8226.0 µg/m³ | Germany, France and 19 more countries, January 2025 |
Daily means, the highest since 6 May 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, Beaumont-sur-Oise, France, 6 May 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/fr/beaumont-sur-oise/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.
Beaumont-sur-Oise 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).