SmogRank / Belgium / Wallonia / Bertrix

Bertrix, month by month

Bertrix has a measured daily mean on 1,058 days since 14 February 2023. Its worst month was February 2025, at 52 US AQI (9.4 µg/m³), 1,278th of 2,633 cities on that month's world ranking. Its cleanest was September 2025, at 9 US AQI (1.7 µg/m³). 2025 averaged 24 US AQI (4.3 µg/m³), against 23 US AQI (4.2 µg/m³) in 2023.

Every month since 2023

202623 so far249 days measured2,736th of 2,791 in the world
Jan37#1,930Feb21#2,752Mar46#2,060Apr14#2,914May19#2,760Jun19 daysJul20#2,726Aug22#2,838Sep12#2,968Oct14#2,698
202524 for the year311 days measured2,613th of 2,681 in the world
Jan28#2,231Feb52#1,278Mar46#1,901Apr22#2,783May17#2,743Jun22#2,410Jul16#2,857Aug22#2,806Sep9#3,101Oct20 daysNov18#2,650Dec20#2,898
2024too few days for a mean (a year needs 257)242 days measured
Jan28#2,083Feb22#2,314Mar14 daysApr20 daysMay23#2,411Jun25#2,312Jul11#2,562Aug13 daysSepnoneOct15 daysNov26#2,376Dec21#2,480
202323 for the year256 days measured1,319th of 1,355 in the world
JanFeb2 daysMar11 daysApr32#1,241May41#1,066Jun31#1,360Jul10#1,429Aug17#1,967Sep17#2,153Oct18#1,973Nov16#2,214Dec19#2,179
Each square is a month's mean PM2.5 in US AQI from Bertrix'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 Bertrix marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
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

9 months
MonthWhy
Jun 202619 of 30 days measured; a month needs 21. The others: 6 with no readings from the monitor, 5 with readings for part of the day (a day needs 18 hours).
Oct 202520 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours), 4 with readings left out by our checks.
Oct 202415 of 31 days measured; a month needs 22. The others: 16 with readings for part of the day (a day needs 18 hours).
Sep 2024No day measured. The others: 30 with readings for part of the day (a day needs 18 hours).
Aug 202413 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.
Apr 202420 of 30 days measured; a month needs 21. The others: 6 with readings for part of the day (a day needs 18 hours), 4 with readings left out by our checks.
Mar 202414 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), 1 with readings left out by our checks.
Mar 202311 of 31 days measured; a month needs 22. The others: 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.

Bertrix's worst months

MonthUS AQIDays measuredWorld rank
February 2025 529.4 µg/m³25 of 281,278thof 2,633
March 2026 468.3 µg/m³26 of 312,060thof 2,971
March 2025 468.2 µg/m³25 of 311,901stof 2,862
May 2023 417.4 µg/m³31 of 311,066thof 1,600
January 2026 376.6 µg/m³26 of 311,930thof 2,617
April 2023 325.8 µg/m³27 of 301,241stof 1,622

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.

Bertrix's worst days

DayUS AQIEpisode
16 Aug 2026 15459.4 µg/m³Germany, Belgium and 2 more countries, August 2026
15 Feb 2023 8225.6 µg/m³Europe, 6 to 25 February 2023
22 May 2023 7924.2 µg/m³–
25 Mar 2025 7924.2 µg/m³–
25 Jan 2026 7924.0 µg/m³–
2 Aug 2024 7823.5 µg/m³–
14 Feb 2023 7622.3 µg/m³Europe, 6 to 25 February 2023
24 Mar 2026 7321.0 µg/m³–
27 Feb 2024 7220.2 µg/m³–
19 Feb 2025 7220.2 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, Bertrix, Belgium, 14 Feb 2023 – 10 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/be/bertrix/history (accessed 12 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.

Bertrix 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).