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Brussels air quality

Belgium · Live AQI and hourly forecast for the next 5 days · updated Sun 01:00 local time

55

Moderate

US AQI, mostly PM2.5

Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.

Next 24 hours
55–61US AQI, highest around Sun 13:00
Best time outside
Sun 01:00–4:00US AQI about 55
PM2.5 vs WHO guideline
1.0×15 µg/m³ over 24 h, guideline 15
Cigarette equivalent
≈ 0.7 a dayBerkeley Earth rule of thumb
European AQI
Fairlevel 2 of 6

Loading the live globe…

The live globe, centred on Brussels. Switch pollutants, drag through the next 5 days or press play. Full map →

Pollutants in Brussels right now

PollutantNowNext 24 h vs WHOUS AQI band
Fine particles (PM2.5) 9.9 µg/m³ 1.0× Moderate
Coarse particles (PM10) 15 µg/m³ 0.4× Good
Nitrogen dioxide (NO2) 21 µg/m³ 0.6× Good
Ozone (O3) 39 µg/m³ 0.8× Good
Sulphur dioxide (SO2) 1.0 µg/m³ 0.0× Good
Carbon monoxide (CO) 183 µg/m³ 0.1× Good
Desert dust0 µg/m³
Smoke and haze (aerosol optical depth)0.20
UV index0.0

“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM2.5, 45 for PM10, 25 for NO2, 40 for SO2 and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline.

Next 48 hours

Hourly US AQI. Highest 61 around Sun 13:00, lowest 52 around Mon 16:00.

Good 0–50Moderate 51–100Sensitive 101–150Unhealthy 151–200Very unhealthy 201–300Hazardous 301+

5-day air quality forecast for Brussels

Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 150.

DayUS AQIAt worstWorst hourPM2.5 avgUV max
Sun 27 Sept 54–61 Moderate 13:00 15 3.2
Mon 28 Sept 52–61 Moderate 0:00 10 2.5
Tue 29 Sept 51–56 Moderate 7:00 9.2 3.0
Wed 30 Sept 30–50 Good 0:00 5.5 1.7
Thu 1 Oct 30–33 Good 14:00 5.8 2.8

Common questions about the air in Brussels

  1. Is the air in Brussels safe today?

    For most people, yes. Right now the US AQI in Brussels is 55, which counts as moderate. Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.

  2. When is the best time to be outside in Brussels?

    Sun 01:00–4:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 55. The worst hour is around Sun 13:00, at 61.

  3. What is the main pollutant in Brussels?

    Fine particles (PM2.5). It drives the index right now, at 9.9 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.

  4. How does Brussels's air compare with the WHO guideline?

    About at the guideline. Over the next 24 hours PM2.5 averages about 15 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. The other pollutants stay within their guideline levels.

  5. How many cigarettes is a day of Brussels's air?

    About 0.7 cigarettes. Over the next 24 hours PM2.5 averages about 15 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.

  6. Will air quality in Brussels improve this week?

    Thursday looks cleanest. Its AQI peaks at 33, against 61 on Sunday, the worst day in the forecast.

Measured near Brussels

StationDistancePM2.5 µg/m³Measured
Unnamed sensor Sensor.Community, low-cost sensor 0.6 km 4.1 Sun 01:49
Unnamed sensor Sensor.Community, low-cost sensor 0.7 km 2.5 Sun 01:48
Unnamed sensor Sensor.Community, low-cost sensor 1.1 km 2.8 Sun 01:49

Air quality near Brussels

All 161 cities

About this forecast

Forecast from CAMS Europe and global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (10 km inside Europe), refreshed twice a day. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown; ground stations, where there are any nearby, show what monitors actually measure. The US AQI follows the US EPA scale and the European AQI the EEA bands. Readings for 50.85°N, 4.35°E, updated 2026-09-26 23:00 UTC.