SmogRank / Belgium / Wallonia / Bastogne

Bastogne, month by month

Bastogne has a measured daily mean on 1,046 days since 14 February 2023. Its worst month was February 2025, at 48 US AQI (8.6 µg/m³), 1,637th of 2,852 cities on that month's world ranking. Its cleanest was July 2024, at 7 US AQI (1.2 µg/m³).

Every month since 2023

202624 so far254 days measured3,125th of 3,214 in the world
Jan33#2,480Feb21#3,067Mar41#2,580Apr16#3,259May17#3,177Jun19#3,104Jul19#2,992Aug21#3,164Sep22#3,075Oct28#2,500
202525 for the year319 days measured2,839th of 2,926 in the world
Jan20 daysFeb48#1,637Mar44#2,139Apr24#2,886May16#3,076Jun18#3,071Jul14#3,057Aug23#2,995Sep18 daysOct28#2,429Nov17#2,874Dec22#3,048
2024too few days for a mean (a year needs 257)229 days measured
Jan23#2,240Feb12#2,469Mar13 daysApr15 daysMay16#2,592Jun28#2,241Jul7#2,566Aug15 daysSepnoneOct14 daysNov18#2,541Dec20 days
2023too few days for a mean (a year needs 256)244 days measured
JanFeb2 daysMar10 daysApr26#1,393May23#1,509Jun26#1,454Jul8#1,431Aug21 daysSep13#2,168Oct14#1,997Nov11#2,232Dec17#2,201
Each square is a month's mean PM2.5 in US AQI from Bastogne's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Bastogne marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Unhealthy for sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

11 months
MonthWhy
Sep 202518 of 30 days measured; a month needs 21. The others: 12 with readings left out by our checks.
Jan 202520 of 31 days measured; a month needs 22. The others: 11 with readings left out by our checks.
Dec 202420 of 31 days measured; a month needs 22. The others: 5 with readings for part of the day (a day needs 18 hours), 6 with readings left out by our checks.
Oct 202414 of 31 days measured; a month needs 22. The others: 16 with readings for part of the day (a day needs 18 hours), 1 with readings left out by our checks.
Sep 2024No day measured. The others: 30 with readings for part of the day (a day needs 18 hours).
Aug 202415 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).
Apr 202415 of 30 days measured; a month needs 21. The others: 6 with readings for part of the day (a day needs 18 hours), 9 with readings left out by our checks.
Mar 202413 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), 2 with readings left out by our checks.
Aug 202321 of 31 days measured; a month needs 22. The others: 5 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours), 1 with readings left out by our checks.
Mar 202310 of 31 days measured; a month needs 22. The others: 1 with readings left out by our checks, 20 missing from OpenAQ's archive.
Feb 20232 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.

Bastogne's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2025 488.6 µg/m³28 of 281,637thof 2,852–
March 2025 448.0 µg/m³31 of 312,139thof 3,102Europe, March 2025
March 2026 417.3 µg/m³31 of 312,580thof 3,285–
January 2026 335.9 µg/m³28 of 312,480thof 2,978–
June 2024 285.0 µg/m³24 of 302,241stof 2,563–
October 2025 285.0 µg/m³23 of 312,429thof 3,010–

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.

Bastogne's worst days

DayUS AQIEpisode
16 Aug 2026 13950.8 µg/m³Germany, Belgium and 2 more countries, August 2026
25 Mar 2025 8828.9 µg/m³Europe, March 2025
25 Jan 2026 7722.8 µg/m³–
20 Mar 2026 7722.8 µg/m³–
30 Jun 2024 7522.2 µg/m³–
10 Feb 2025 7522.2 µg/m³–
24 Mar 2026 7421.6 µg/m³–
21 Mar 2026 7220.2 µg/m³–
15 Feb 2023 6918.6 µg/m³–
22 May 2023 6818.4 µg/m³–

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, Bastogne, Belgium, 14 Feb 2023 – 13 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/be/bastogne/history (accessed 14 Oct 2026).

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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.

Bastogne now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-14 02:07 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).