Portimão Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (11 October): Air quality in Portimão is fair. AQI, PM2.5, and O3 are fair; PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (PM2.5: 35.8/100).
Air Quality Tomorrow
Tomorrow (12 October 2026): Air quality in Portimão is moderate. AQI worsens to moderate; PM2.5 increases to moderate; PM10 increases to fair; all other pollutants stay as today. Pollution peaks around 2:00 PM (PM2.5: 43.4/100).
Explore Forecasts
Pollen & Mold
Air Quality in Other Cities
Pollen in Other Cities
Get More in Our App
Local pollen and air quality forecasts, interactive pollen maps and route profiles
Features and forecast availability vary by region.
Air Quality
Today - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 35.8/100 |
| PM2.5 (fine particles) | Fair | 35.8/100 |
| PM10 (coarse particles) | Good | 17.7/100 |
| NO2 (nitrogen dioxide) | Good | 3.1/100 |
| O3 (ozone) | Fair | 30.4/100 |
| SO2 (sulfur dioxide) | Good | 0.9/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 1.7/100 |
| PM1 (ultrafine particles) | Good | 7.0/100 |
Tomorrow - 12 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Moderate | 43.4/100 |
| PM2.5 (fine particles) | Moderate | 43.4/100 |
| PM10 (coarse particles) | Fair | 25.3/100 |
| NO2 (nitrogen dioxide) | Good | 7.7/100 |
| O3 (ozone) | Fair | 30.6/100 |
| SO2 (sulfur dioxide) | Good | 0.9/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 1.6/100 |
| PM1 (ultrafine particles) | Good | 9.6/100 |
Local Environmental Conditions
Around the center of Portimão, a mix of built-up land and open space means traffic is an important, but not overwhelming, local pollution source. Sea breezes along the coast usually help ventilate the area. Port and shipping activity adds to local emissions. On some days, pollution drifting in from farther away outweighs local sources.
Air near roads is often at its worst from January to March, when nights cool to around 15°C and the air turns still. In the warmer months, ozone is the main concern from June to October, when sunny days averaging 21°C turn traffic and other emissions into ozone by mid-afternoon. Overall, stronger winds around January, about 20 km/h on average, usually bring some of the cleanest air of the year.
Get pollen & AQ on Strava
Follow your environmental exposure and performance with the free Airmine-Strava integration. See your pollen and air quality exposure for every Strava activity.
Resource Hub
Frequently Asked Questions About Air Quality in Faro
Is air quality bad in Portimão right now?
On 11 October 2026, overall air quality in Portimão is fair. AQI is the main air quality indicator at 35.8/100. Pollution peaks around 10:00 PM (PM2.5: 35.8/100).
Will air quality be worse tomorrow in Portimão?
On 12 October 2026, air quality conditions in Portimão will be worse than today, with AQI forecast at moderate at 43.4/100. Pollution peaks around 2:00 PM (PM2.5: 43.4/100).
When is air pollution at its worst in Portimão?
Air near roads is often at its worst from January to March, when nights cool to around 15°C and the air turns still. In the warmer months, ozone is the main concern from June to October, when sunny days averaging 21°C turn traffic and other emissions into ozone by mid-afternoon. Overall, stronger winds around January, about 20 km/h on average, usually bring some of the cleanest air of the year.
Are air quality levels in Portimão 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. |