SmogRank / Belgium / Wallonia / Eupen

Eupen, month by month

Eupen has a measured daily mean on 1,096 days since 11 January 2023. Its worst month was February 2025, at 58 US AQI (13.0 µg/m³), 961st of 2,633 cities on that month's world ranking. Its cleanest was July 2024, at 12 US AQI (2.2 µg/m³). 2025 averaged 29 US AQI (5.2 µg/m³), against 30 US AQI (5.4 µg/m³) in 2023.

Every month since 2023

202624 so far256 days measured2,716th of 2,791 in the world
Jan46#1,433Feb21#2,760Mar44#2,171Apr22#2,713May18#2,788Jun19 daysJul16#2,767Aug19#2,872Sep14#2,946Oct18#2,616
202529 for the year266 days measured2,503rd of 2,681 in the world
Jan44#1,406Feb58#961Mar12 daysApr3 daysMay18#2,711Jun20 daysJul15#2,865Aug19#2,857Sep20 daysOct21 daysNov19#2,622Dec33#2,447
2024too few days for a mean (a year needs 257)254 days measured
Jan52#907Feb31#1,956Mar13 daysApr15#2,464May33#2,043Jun27#2,253Jul12#2,558Aug13 daysSepnoneOct14 daysNov31#2,137Dec33#2,083
202330 for the year320 days measured1,234th of 1,355 in the world
Jan6 daysFeb56#571Mar31#761Apr40#1,001May51#604Jun39#1,208Jul14#1,408Aug18#1,962Sep16#2,157Oct12#2,008Nov22#2,126Dec24#2,108
Each square is a month's mean PM2.5 in US AQI from Eupen'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 Eupen 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

11 months
MonthWhy
Jun 202619 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Oct 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Sep 202520 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jun 202520 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Apr 20253 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Mar 202512 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Oct 202414 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 202413 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Mar 202413 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jan 20236 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 14 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.

Eupen's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2025 5813.0 µg/m³25 of 28961stof 2,633Europe, 14 February to 1 March 2025
Europe, 1 to 14 February 2025
February 2023 5611.6 µg/m³27 of 28571stof 1,129Europe, 28 February to 4 March 2023
Europe, 6 to 25 February 2023
January 2024 529.8 µg/m³30 of 31907thof 2,385Europe, 8 to 27 January 2024
May 2023 519.2 µg/m³31 of 31604thof 1,600Europe, May 2023
January 2026 468.2 µg/m³27 of 311,433rdof 2,617Europe, January and February 2026
January 2025 448.0 µg/m³27 of 311,406thof 2,474–

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.

Eupen's worst days

DayUS AQIEpisode
26 Jan 2026 10838.2 µg/m³Europe, January and February 2026
11 Jan 2024 10235.9 µg/m³Europe, 8 to 27 January 2024
3 Mar 2023 9935.1 µg/m³Europe, 28 February to 4 March 2023
13 Feb 2025 9633.2 µg/m³Europe, 1 to 14 February 2025
18 Jan 2024 9130.8 µg/m³Europe, 8 to 27 January 2024
22 May 2023 8929.7 µg/m³Europe, May 2023
27 Feb 2024 8929.4 µg/m³–
14 Feb 2025 8728.3 µg/m³Europe, 14 February to 1 March 2025
Europe, 1 to 14 February 2025
10 Feb 2025 8426.7 µg/m³Europe, 1 to 14 February 2025
10 Feb 2023 8225.5 µg/m³Europe, 6 to 25 February 2023

Daily means, the highest since 11 Jan 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, Eupen, Belgium, 11 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/be/eupen/history (accessed 12 Oct 2026).

Download chart (PNG)

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.

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

Updated 2026-10-12 18:07 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).