SmogRank / Belgium / Flanders / Beersel
Beersel, month by month
Beersel has a measured daily mean on 306 days since 20 September 2025. Its worst month was March 2026, at 66 US AQI (17.1 µg/m³), 711th of 2,971 cities on that month's world ranking. Its cleanest was September 2026, at 24 US AQI (4.3 µg/m³).
Every month since 2025
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
6 months
| Month | Why |
|---|---|
| Oct 2026 | 2 of 11 days measured; a month needs 8. The others: 2 with no readings from the monitors, 3 with readings for part of the day (a day needs 18 hours), 4 with readings left out by our checks. |
| Jan 2026 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 11 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 7 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Sep 2025 | 8 of 30 days measured; a month needs 21. The others: 3 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.
Beersel's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2026 | 6617.1 µg/m³ | 711thof 2,971 | Europe, 18 to 25 March 2026 Europe, 1 to 12 March 2026 |
| February 2026 | 5511.1 µg/m³ | 1,172ndof 2,866 | Europe, January and February 2026 |
| May 2026 | 427.5 µg/m³ | 1,480thof 2,874 | – |
| June 2026 | 376.7 µg/m³ | 1,589thof 2,497 | Belgium, France and 2 more countries, June 2026 |
| April 2026 | 376.6 µg/m³ | 2,009thof 2,941 | – |
| July 2026 | 346.2 µg/m³ | 2,374thof 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.
Beersel's worst days
| Day | US AQI | Episode |
|---|---|---|
| 7 Mar 2026 | 15055.4 µg/m³ | Europe, 1 to 12 March 2026 |
| 8 Mar 2026 | 14653.9 µg/m³ | Europe, 1 to 12 March 2026 |
| 23 Mar 2026 | 13549.3 µg/m³ | Europe, 18 to 25 March 2026 |
| 26 Jan 2026 | 12143.8 µg/m³ | Europe, January and February 2026 |
| 20 Mar 2026 | 11641.6 µg/m³ | Europe, 18 to 25 March 2026 |
| 24 Mar 2026 | 11541.1 µg/m³ | Europe, 18 to 25 March 2026 |
| 19 Jan 2026 | 11239.8 µg/m³ | Europe, January and February 2026 |
| 9 Mar 2026 | 10838.3 µg/m³ | Europe, 1 to 12 March 2026 |
| 22 Mar 2026 | 10637.6 µg/m³ | Europe, 18 to 25 March 2026 |
| 13 Dec 2025 | 10436.9 µg/m³ | – |
Daily means, the highest since 20 Sept 2025; 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, Beersel, Belgium, 20 Sep 2025 – 2 Oct 2026. Monitor data from AirGradient via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/be/beersel/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.
Beersel now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 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).