Lille Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (11 October): Air quality in Lille is moderate. AQI and NO2 are moderate; PM2.5, PM10, and O3 are fair; SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 PM (NO2: 44.8/100).
Air Quality Tomorrow
Tomorrow (12 October 2026): Air quality in Lille is fair. AQI improves to fair; PM10 decreases to good; NO2 decreases to fair; O3 decreases to good; all other pollutants stay as today. Pollution peaks around 10:00 AM (NO2: 33.5/100).
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Air Quality
Today - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Moderate | 44.8/100 |
| PM2.5 (fine particles) | Fair | 37.9/100 |
| PM10 (coarse particles) | Fair | 21.8/100 |
| NO2 (nitrogen dioxide) | Moderate | 44.8/100 |
| O3 (ozone) | Fair | 21.7/100 |
| SO2 (sulfur dioxide) | Good | 2.1/100 |
| CO (carbon monoxide) | Good | 0.8/100 |
| HCHO (formaldehyde) | Good | 10.8/100 |
| PM1 (ultrafine particles) | Good | 18.7/100 |
Tomorrow - 12 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 33.5/100 |
| PM2.5 (fine particles) | Fair | 28.6/100 |
| PM10 (coarse particles) | Good | 16.0/100 |
| NO2 (nitrogen dioxide) | Fair | 33.5/100 |
| O3 (ozone) | Good | 19.4/100 |
| SO2 (sulfur dioxide) | Good | 1.9/100 |
| CO (carbon monoxide) | Good | 0.8/100 |
| HCHO (formaldehyde) | Good | 7.4/100 |
| PM1 (ultrafine particles) | Good | 12.6/100 |
Local Environmental Conditions
The heart of Lille is largely built up, so vehicle exhaust and urban activity dominate the local air pollution sources. Local sources include manufacturing. Home heating, especially wood stoves and fireplaces, adds smoke and fine particles in the colder months. Winds here are fairly strong, averaging around 15 km/h, which helps disperse local pollution. Air arriving from elsewhere in the region adds to what is produced locally.
Summers are mild, averaging around 19°C in the warmest month, so ozone usually stays moderate even from June to September. Particle levels tend to be highest from November to March, when home heating and traffic add more emissions and cold, calm spells at around 3°C can leave a light winter haze over the city.
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Frequently Asked Questions About Air Quality in Hauts-de-France
Is air quality bad in Lille right now?
On 11 October 2026, overall air quality in Lille is moderate. AQI is the main air quality indicator at 44.8/100. Pollution peaks around 9:00 PM (NO2: 44.8/100).
Will air quality be worse tomorrow in Lille?
On 12 October 2026, air quality conditions in Lille will be better than today, with AQI forecast at fair at 33.5/100. Pollution peaks around 10:00 AM (NO2: 33.5/100).
When is air pollution at its worst in Lille?
Summers are mild, averaging around 19°C in the warmest month, so ozone usually stays moderate even from June to September. Particle levels tend to be highest from November to March, when home heating and traffic add more emissions and cold, calm spells at around 3°C can leave a light winter haze over the city.
Are air quality levels in Lille based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |