Sant Martí, Barcelona Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Sant Martí is moderate. AQI, PM2.5, and NO2 are moderate; PM10 and PM1 are fair; O3, SO2, CO, and HCHO are good. Pollution peaks around 9:00 PM (NO2: 51.3/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Sant Martí is moderate. All pollutants stay as today. Pollution peaks around 2:00 AM (PM2.5: 44.7/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Moderate | 51.3/100 |
| PM2.5 (fine particles) | Moderate | 44.2/100 |
| PM10 (coarse particles) | Fair | 23.4/100 |
| NO2 (nitrogen dioxide) | Moderate | 51.3/100 |
| O3 (ozone) | Good | 15.9/100 |
| SO2 (sulfur dioxide) | Good | 4.3/100 |
| CO (carbon monoxide) | Good | 0.9/100 |
| HCHO (formaldehyde) | Good | 9.4/100 |
| PM1 (ultrafine particles) | Fair | 33.6/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Moderate | 44.7/100 |
| PM2.5 (fine particles) | Moderate | 44.7/100 |
| PM10 (coarse particles) | Fair | 23.4/100 |
| NO2 (nitrogen dioxide) | Moderate | 44.1/100 |
| O3 (ozone) | Good | 11.9/100 |
| SO2 (sulfur dioxide) | Good | 4.2/100 |
| CO (carbon monoxide) | Good | 0.8/100 |
| HCHO (formaldehyde) | Good | 10.5/100 |
| PM1 (ultrafine particles) | Fair | 30.9/100 |
Local Environmental Conditions
This location in Barcelona is largely built up, so vehicle exhaust and urban activity dominate the local air pollution sources. Pockets of trees and green space help filter a small share of the particles from traffic. Air arriving from elsewhere in the region adds to what is produced locally. Levels are generally highest right next to busy roads and drop off quickly with distance.
Fine particle levels climb from December to February, as home heating and traffic combine with cold, still air averaging 10°C. Later in the year, hot afternoons from June to September, averaging 26°C in the warmest month, are when ozone is most likely to build up. March is usually the windiest month, averaging about 15 km/h, which helps keep the air clean.
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Frequently Asked Questions About Air Quality in Catalonia
Is air quality bad in Sant Martí right now?
On 10 October 2026, overall air quality in Sant Martí is moderate. AQI is the main air quality indicator at 51.3/100. Pollution peaks around 9:00 PM (NO2: 51.3/100).
Will air quality be worse tomorrow in Sant Martí?
On 11 October 2026, air quality conditions in Sant Martí will be similar to today, with AQI forecast at moderate at 44.7/100. Pollution peaks around 2:00 AM (PM2.5: 44.7/100).
When is air pollution at its worst in Sant Martí?
Fine particle levels climb from December to February, as home heating and traffic combine with cold, still air averaging 10°C. Later in the year, hot afternoons from June to September, averaging 26°C in the warmest month, are when ozone is most likely to build up. March is usually the windiest month, averaging about 15 km/h, which helps keep the air clean.
Are air quality levels in Sant Martí 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. |