Belgium · The summary is refreshed every 15 minutes.
November 11
The air is unhealthy now
Aalst
6°C
Rain
1003
hPaAtmospheric
pressure
93%
Humidity
Aalst, November 10, 2026: daily mean PM2.5 43 µg/m³ (4 sensors), level “Elevated” — as in the Atmy Data Hub. Now (23:00 local time): 59.1 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON
Right now in Aalst, PM2.5 averages 59.1 µg/m³ — “unhealthy” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors from Sensor.Community, readings from 22:06–22:58 local time (21:06–21:58 UTC), summary prepared at 23:00 local time. Median: 32.2 µg/m³; range across sensors: 20.8–151.5 µg/m³.
In Aalst the air is unhealthy 🔴 AQI 154. Higher than three hours ago. 🌧️ +6 °C · Precipitation 0.1 mm · Wind 3 m/s
In Aalst the air is unhealthy right now (approximate, US EPA scale). From 10:00 to 23:00 local time the city mean PM2.5 rose from 44.6 to 59.1 µg/m³.
High humidity (93%) possibly makes optical sensors read somewhat higher.
Weather now: rain, 6°C, wind 3 m/s, humidity 93%. No major change in the wind is expected in the coming hours.
Written automatically at 23:00 local time (22:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
3 m/s
Wind, NNE
1.5 mm
Precipitation today
43 µg/m³ Elevated
Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 01:00–01:00 UTC+1): 43 µg/m³ from 4 sensors that passed the quality check — the same value as in the Atmy Data Hub.
18/100Low · An estimate of weather conditions · not a PM2.5 forecast
6°/5°
Index by time of day
43/100Moderate
Night
Morning
Day
Evening10°/3°
Index by time of day
46/100Moderate
NightMorningDayEvening10°/4°
Index by time of day
52/100Moderate
NightMorningDayEvening6°/-2°
Index by time of day
51/100Moderate
NightMorningDayEvening12°/3°
Index by time of day
41/100Moderate
NightMorningDayEvening11°/7°
Index by time of day
21/100Low
NightMorningDayEveningForecast of conditions that trap pollution near the surface
6°
Rain. Feels like 3°C
6°C94%6°C94%6°C94%3m/sWind from the NNE
4m/sWind gusts
Wind force: 2
Gusts up to 5 m/s are expected.
Belgium
6°C5°C10°C3°C10°C4°C
6°C-2°C12°C3°C11°C7°C8°C4°C11°C8°C10°C8°C8°C4°C
Highest current reading: 151.5 µg/m³ (SC #30102). Lowest: 20.8 µg/m³ (SC #22764). The list shows every sensor, highest first.
Source: atmy.ai monitoring network
Sensors in the summary by network: Sensor.Community — 4 sensors.
Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.
282
BrusselsBelgium
93GhentBelgium
49LeuvenBelgium
47Cities with the most sensors
All sensors on the map, by city as the map assigns them; the city’s values count only the sensors that pass the Data Hub’s quality check.
Daily mean PM2.5 of the city sensors, µg/m³
Click a day to see its date and value.
An Atmy card with the air quality in Aalst now: it is refreshed every 15 minutes and links to this page. Paste the code into your site.
Belgium · City ranking · All pilot cities
Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 01:00–01:00 UTC+1): 43 µg/m³ from 4 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 1 of 10 cities in Belgium and No. 64 of 676 worldwide, from the most polluted.
Right now in Aalst, PM2.5 averages 59.1 µg/m³ — “unhealthy” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors from Sensor.Community, readings from 22:06–22:58 local time (21:06–21:58 UTC), summary prepared at 23:00 local time. Median: 32.2 µg/m³; range across sensors: 20.8–151.5 µg/m³.
The current level is “unhealthy” (US EPA scale, approximate). Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it. This is the standard guidance of the scale, not medical advice.
Highest current reading: 151.5 µg/m³ (SC #30102). Lowest: 20.8 µg/m³ (SC #22764). The list shows every sensor, highest first.
From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.
The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.
The daily value is the Data Hub’s: the mean of the city’s sensors that passed the nightly quality check, each with at least 12 valid hours, and only with sensors at four places 500 m apart; days are UTC.
“Now” uses the same sensors and rule: the mean of their latest readings, each at most 60 minutes old, shown only with sensors at four places 500 m apart reporting.
Source: public Atmy monitoring data. Methodology and data sources · Data terms
