Air quality in Brussels, Belgium today

Mr. Duck’s Air Quality Score

Good air today for Brussels, Belgium

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Brussels today is classified as Good. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 2.2824 and a PM10 reference value of 5.5454, based on 34 valid observations collected via OpenAQ.

Overall conditions meet the criteria for a Good rating according to the provided assessment. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.

Latest sensor values

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

What the data includes

The Brussels air‑quality dataset currently contains measurements for eight pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 1 (PM₁), PM₁₀, PM₂.5, sulphur dioxide (SO₂) and relative humidity – drawn from 15 monitoring rows. Across all stations, 36 of the most recent entries have been updated within the last three days, while 24 rows are older than that; there are no unknown‑age records. Freshness varies by pollutant: CO, NO₂, O₃, PM₁₀ and PM₂.5 were all refreshed on 2026‑02‑10 18:00 UTC, SO₂ last appears on 2024‑07‑09 06:00 UTC, and both PM₁ and relative humidity date from 2025‑12‑29 13:00 UTC.

Typical values show a modest spread for most gases. The median NO₂ concentration is 26.75 µg/m³, ranging from 7.5 to 42 µg/m³, while O₃ sits at a median of 40 µg/m³ with a narrower range of 12–56 µg/m³. Particulate matter levels are low: PM₂.5 has a median of 2.28 µg/m³ (1.87–12.87 µg/m³) and PM₁₀ a median of 5.55 µg/m³ (4.89–67.22 µg/m³). CO is consistently high, with a median of 542.5 µg/m³ and values between 515 and 555 µg/m³. SO₂ remains very low, centred around 4.35 µg/m³ (4.15–5.15 µg/m³). The single humidity reading is 56.07 %.

Because the dataset includes both recent and older rows, coverage is uneven: while gases such as NO₂, O₃, CO, PM₁₀ and PM₂.5 benefit from very fresh data, SO₂, PM₁ and relative humidity rely on measurements that are months old. Consequently, the snapshot reflects current conditions for some pollutants but may be less representative for others, and air quality can differ across neighbourhoods and over time.

Learn more about sources and filtering: About the data.

Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)

Latest sensor values (bars)

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

Data notes

The dataset for Brussels includes 34 valid measurements and is Updated within 3 days, with the most recent values recorded on 2026‑02‑10T18:00:00+00:00. These figures represent a snapshot of current conditions; air quality can vary across different neighbourhoods and at different times of day within the city, so individual experiences may differ from the reported averages.

OpenAQ station rows