Hippodrome de Longchamp, Paris Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Hippodrome de Longchamp is fair. AQI and NO2 are fair; PM2.5, PM10, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (NO2: 25.4/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Hippodrome de Longchamp is moderate. AQI worsens to moderate; PM2.5 increases to moderate; PM10 increases to fair; NO2 increases to moderate; HCHO increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 48.4/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 25.4/100 |
| PM2.5 (fine particles) | Good | 15.6/100 |
| PM10 (coarse particles) | Good | 11.2/100 |
| NO2 (nitrogen dioxide) | Fair | 25.4/100 |
| O3 (ozone) | Good | 18.9/100 |
| SO2 (sulfur dioxide) | Good | 1.0/100 |
| CO (carbon monoxide) | Good | 0.6/100 |
| HCHO (formaldehyde) | Good | 8.8/100 |
| PM1 (ultrafine particles) | Good | 9.3/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Moderate | 48.4/100 |
| PM2.5 (fine particles) | Moderate | 40.2/100 |
| PM10 (coarse particles) | Fair | 25.3/100 |
| NO2 (nitrogen dioxide) | Moderate | 48.4/100 |
| O3 (ozone) | Good | 19.9/100 |
| SO2 (sulfur dioxide) | Good | 2.2/100 |
| CO (carbon monoxide) | Good | 0.9/100 |
| HCHO (formaldehyde) | Fair | 25.2/100 |
| PM1 (ultrafine particles) | Fair | 31.9/100 |
Local Environmental Conditions
This location in Paris lies in a lightly developed area, where local traffic adds relatively little to air pollution. Trees nearby help filter some particles from the air, though in hot weather they also emit compounds that feed ozone formation. On some days, pollution drifting in from farther away outweighs local sources.
Fine particle levels climb from November to March, as wood burning and traffic combine with cold, still air averaging 3°C. By contrast, summers are mild, averaging around 20°C in the warmest month, so ozone usually stays moderate even from June to September. On the plus side, breezy weather in February, with winds near 20 km/h, tends to sweep pollution away.
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Frequently Asked Questions About Air Quality in Paris
Is air quality bad in Hippodrome de Longchamp right now?
On 10 October 2026, overall air quality in Hippodrome de Longchamp is fair. AQI is the main air quality indicator at 25.4/100. Pollution peaks around 9:00 AM (NO2: 25.4/100).
Will air quality be worse tomorrow in Hippodrome de Longchamp?
On 11 October 2026, air quality conditions in Hippodrome de Longchamp will be worse than today, with AQI forecast at moderate at 48.4/100. Pollution peaks around 8:00 PM (NO2: 48.4/100).
When is air pollution at its worst in Hippodrome de Longchamp?
Fine particle levels climb from November to March, as wood burning and traffic combine with cold, still air averaging 3°C. By contrast, summers are mild, averaging around 20°C in the warmest month, so ozone usually stays moderate even from June to September. On the plus side, breezy weather in February, with winds near 20 km/h, tends to sweep pollution away.
Are air quality levels in Hippodrome de Longchamp 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. |