Lisbon air quality
Portugal · Live AQI and hourly forecast for the next 5 days · updated Sun 00:00 local time
Good
Great air. A perfect time to be outside.
- Next 24 hours
- 43–55US AQI, highest around Sun 23:00
- Best time outside
- Sun 00:00–3:00US AQI about 44
- PM2.5 vs WHO guideline
- 0.8×12 µg/m³ over 24 h, guideline 15
- Cigarette equivalent
- ≈ 0.5 a dayBerkeley Earth rule of thumb
- European AQI
- Fairlevel 2 of 6
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Pollutants in Lisbon right now
| Pollutant | Now | Next 24 h vs WHO | US AQI band |
|---|---|---|---|
| Fine particles (PM2.5) | 8.7 µg/m³ | 0.8× | Good |
| Coarse particles (PM10) | 18 µg/m³ | 0.4× | Good |
| Nitrogen dioxide (NO2) | 8.2 µg/m³ | 0.4× | Good |
| Ozone (O3) | 71 µg/m³ | 0.7× | Good |
| Sulphur dioxide (SO2) | 1.2 µg/m³ | 0.0× | Good |
| Carbon monoxide (CO) | 136 µg/m³ | 0.0× | Good |
| Desert dust | 11 µg/m³ | ||
| Smoke and haze (aerosol optical depth) | 0.23 | ||
| UV index | 0.0 |
“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM2.5, 45 for PM10, 25 for NO2, 40 for SO2 and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline.
Next 48 hours
Hourly US AQI. Highest 59 around Mon 09:00, lowest 43 around Sun 00:00.
5-day air quality forecast for Lisbon
Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 150.
| Day | US AQI | At worst | PM2.5 avg | |
|---|---|---|---|---|
| Sun 27 Sept | 43–55 | 12 | ||
| Mon 28 Sept | 55–59 | 14 | ||
| Tue 29 Sept | 58–61 | 15 | ||
| Wed 30 Sept | 55–61 | 12 | ||
| Thu 1 Oct | 54–56 | 9.5 |
Common questions about the air in Lisbon
Is the air in Lisbon safe today?
Yes. Right now the US AQI in Lisbon is 43, which counts as good. Great air. A perfect time to be outside. It is expected to reach 55 (moderate) around Sun 23:00.
When is the best time to be outside in Lisbon?
Sun 00:00–3:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 44. The worst hour is around Sun 23:00, at 55.
What is the main pollutant in Lisbon?
Fine particles (PM2.5). It drives the index right now, at 8.7 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.
How does Lisbon's air compare with the WHO guideline?
Within the guideline. Over the next 24 hours PM2.5 averages about 12 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. The other pollutants stay within their guideline levels.
How many cigarettes is a day of Lisbon's air?
About 0.5 cigarettes. Over the next 24 hours PM2.5 averages about 12 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.
Will air quality in Lisbon improve this week?
Today looks cleanest. Its AQI peaks at 55, against 61 on Tuesday, the worst day in the forecast.
Measured near Lisbon
| Station | PM2.5 µg/m³ | Measured |
|---|---|---|
| Unnamed sensor Sensor.Community, low-cost sensor | 0.8 | Sun 00:49 |
| Unnamed sensor Sensor.Community, low-cost sensor | 2.7 | Sun 00:48 |
| Unnamed sensor Sensor.Community, low-cost sensor | 2.1 | Sun 00:49 |
Air quality near Lisbon
- Madrid 502 km NE
- Casablanca 589 km S
- Barcelona 1,006 km E
- Algiers 1,094 km E
- Marseille 1,317 km NE
- Lyon 1,388 km NE
About this forecast
Forecast from CAMS Europe and global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (10 km inside Europe), refreshed twice a day. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown; ground stations, where there are any nearby, show what monitors actually measure. The US AQI follows the US EPA scale and the European AQI the EEA bands. Readings for 38.72°N, 9.14°W, updated 2026-09-26 23:00 UTC.