Air quality in Hoeilaart, Flemish Brabant, Belgium today

Mr. Duck’s Air Quality Score

Good air today for Hoeilaart, Flemish Brabant, 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 Hoeilaart today is classified as Good. The primary pollutant measured is PM2.5, with a recorded concentration of approximately 0.85 µg/m³ based on the latest data set. A total of fifteen valid measurements were used to determine this assessment.

Data is shown via OpenAQ and reflects the current monitoring results for Hoeilaart in Flemish Brabant, Belgium. 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 dataset for Hoeilaart in Flemish Brabant contains measurements from five monitoring stations, together providing twenty‑five individual rows of data. All recorded values were last updated on 2026‑02‑10 at 18:00 UTC, which falls within the “updated within three days” freshness window, so the information reflects very recent conditions across the city.

Five pollutants are reported. For PM1 the observed concentrations range from a minimum of 0.0 µg/m³ to a maximum of 9.8 µg/m³, with a median value of about 0.10 µg/m³; the 90th percentile sits near 5.95 µg/m³, indicating that most readings are low but occasional higher spikes occur. PM2.5 values span from 0.65 µg/m³ up to 23.9 µg/m³, with a median of roughly 0.70 µg/m³ and the 90th percentile at 14.68 µg/m³, showing a broader spread than PM1. Relative humidity measurements cover a narrow band between 52.3 % and 98.5 %, centering on a median of 93 % and reaching the upper‑range percentiles close to 98 %. Temperature readings vary from 5.6 °C to 20.48 °C, with a typical (median) value of about 8.7 °C; most observations fall between roughly 6.68 °C (10th percentile) and 16.33 °C (90th percentile). Finally, particle counts (UM003) are recorded in particles per cubic centimetre, ranging from 167 to 667, with a median of 210.5 and the 90th percentile near 487.9, indicating occasional periods of higher particulate density.

Overall, the data set offers complete coverage for each pollutant across all five stations, and every entry is recent. The ranges show that while most measurements sit near the lower end of their possible spans, the upper percentiles reveal that conditions can differ noticeably between locations or moments within Hoeilaart.

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 Hoeilaart includes 15 valid measurements and is refreshed regularly, having been updated within the past three days (last update: 2026‑02‑10T18:00:00+00:00). These figures represent a snapshot of current conditions; air quality can differ across neighborhoods and change throughout the day, so values may not reflect every location or moment in the city.

OpenAQ station rows