SmogRank / Belgium / Wallonia / Habay-la-Vieille
Habay-la-Vieille, month by month
Habay-la-Vieille has a measured daily mean on 1,086 days since 14 February 2023. Its worst month was February 2025, at 56 US AQI (11.7 µg/m³), 1,040th of 2,633 cities on that month's world ranking. Its cleanest was September 2025, at 9 US AQI (1.6 µg/m³). 2025 averaged 25 US AQI (4.5 µg/m³), against 22 US AQI (4.0 µg/m³) in 2023.
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
7 months
| Month | Why |
|---|---|
| Jun 2026 | 17 of 30 days measured; a month needs 21. The others: 6 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours), 1 with readings left out by our checks. |
| Oct 2024 | 15 of 31 days measured; a month needs 22. The others: 16 with readings for part of the day (a day needs 18 hours). |
| Sep 2024 | No day measured. The others: 1 with no readings from the monitor, 29 with readings for part of the day (a day needs 18 hours). |
| Aug 2024 | 13 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 15 with readings for part of the day (a day needs 18 hours), 2 with readings left out by our checks. |
| Mar 2024 | 15 of 31 days measured; a month needs 22. The others: 10 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours). |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 2 of 28 days measured; a month needs 20. The others: 13 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Habay-la-Vieille's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 5611.7 µg/m³ | 1,040thof 2,633 | Europe, 1 to 14 February 2025 |
| March 2025 | 468.3 µg/m³ | 1,885thof 2,862 | – |
| March 2026 | 397.0 µg/m³ | 2,362ndof 2,971 | – |
| January 2025 | 386.9 µg/m³ | 1,728thof 2,474 | – |
| January 2024 | 376.7 µg/m³ | 1,623rdof 2,385 | – |
| January 2026 | 376.6 µg/m³ | 1,930thof 2,617 | – |
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.
Habay-la-Vieille's worst days
| Day | US AQI | Episode |
|---|---|---|
| 10 Feb 2025 | 8627.7 µg/m³ | Europe, 1 to 14 February 2025 |
| 15 Feb 2023 | 8527.6 µg/m³ | Europe, 6 to 25 February 2023 |
| 16 Aug 2026 | 8225.5 µg/m³ | Germany, Belgium and 2 more countries, August 2026 |
| 19 Jan 2025 | 7923.9 µg/m³ | – |
| 25 Mar 2025 | 7823.4 µg/m³ | – |
| 22 May 2023 | 7622.3 µg/m³ | – |
| 14 Feb 2023 | 7522.0 µg/m³ | Europe, 6 to 25 February 2023 |
| 8 Feb 2025 | 7421.7 µg/m³ | Europe, 1 to 14 February 2025 |
| 19 Feb 2025 | 7421.7 µg/m³ | – |
| 3 Feb 2025 | 7421.2 µg/m³ | Europe, 1 to 14 February 2025 |
Daily means, the highest since 14 Feb 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, Habay-la-Vieille, Belgium, 14 Feb 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/be/habay-la-vieille/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.
Habay-la-Vieille now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).