Is the air in Lisbon safe today?

Yes. Right now the US AQI in Lisbon is 42, which counts as good. Great air. A perfect time to be outside.

When is the best time to be outside in Lisbon?

Sat 11:00–14:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 27. The worst hour is around Fri 18:00, at 47.

What is the main pollutant in Lisbon?

Fine particles (PM2.5). It drives the index right now, at 7.6 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 6.1 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 0.3 cigarettes. Over the next 24 hours PM2.5 averages about 6.1 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?

Monday looks cleanest. Its AQI peaks at 35, against 56 on Saturday, the worst day in the forecast.

Lisbon air quality

Portugal · Live AQI and hourly forecast for the next 5 days · valid Fri 17:00 local time

Good

US AQI, mostly PM_2.5

Model estimate. Nearby measurements are shown separately.

Great air. A perfect time to be outside.

Next 24 hours: 26–47US AQI, highest around Fri 18:00
Best time outside: Sat 11:00–14:00US AQI about 27
PM_2.5 vs WHO guideline: 0.4×6.1 µg/m³ over 24 h, guideline 15
Cigarette equivalent: ≈ 0.3 a dayBerkeley Earth rule of thumb

Loading the live globe…

The live globe, centred on Lisbon. Switch pollutants, drag through the next 5 days or press play. Full map →

Pollutants in Lisbon right now

Pollutant	Now	Level	Next 24 h vs WHO
Fine particles PM_2.5	7.6 µg/m³	Good	0.4×
Coarse particles PM₁₀	18 µg/m³	Good	0.3×
Nitrogen dioxide NO₂	9.9 µg/m³	Good	0.4×
Ozone O₃	56 µg/m³	Good	0.6×
Sulphur dioxide SO₂	1.5 µg/m³	Good	0.0×
Carbon monoxide CO	170 µg/m³	Good	0.0×
Aerosol optical depth	0.10	Whole atmosphere · dimensionless
Desert dust	0 µg/m³	Modelled surface dust
UV index	0	Low

“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 PM_2.5, 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. Levels follow the US AQI, which is far less strict than the WHO, so air rated Good can still be above a guideline.

Next 48 hours

Hourly US AQI. Highest 56 around Sat 21:00, lowest 26 around Sat 11:00.

Good 0–50Moderate 51–100Sensitive 101–150Unhealthy 151–200Very unhealthy 201–300Hazardous 301+

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	Worst hour	PM_2.5 avg	UV max
Fri 13 Nov	34–48	Good	9:00	7.4	3 Moderate
Sat 14 Nov	26–56	Moderate	21:00	6.5	2 Low
Sun 15 Nov	26–42	Good	0:00	4.2	1 Low
Mon 16 Nov	28–35	Good	0:00	4.0	1 Low
Tue 17 Nov	22–52	Moderate	23:00	6.5	2 Low

Common questions about the air in Lisbon

Is the air in Lisbon safe today?
Yes. Right now the US AQI in Lisbon is 42, which counts as good. Great air. A perfect time to be outside.
When is the best time to be outside in Lisbon?
Sat 11:00–14:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 27. The worst hour is around Fri 18:00, at 47.
What is the main pollutant in Lisbon?
Fine particles (PM_2.5). It drives the index right now, at 7.6 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 PM_2.5 averages about 6.1 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 0.3 cigarettes. Over the next 24 hours PM_2.5 averages about 6.1 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?
Monday looks cleanest. Its AQI peaks at 35, against 56 on Saturday, the worst day in the forecast.

Measured near Lisbon

Station and measurements	Distance	US AQI	Level
Avenida da Liberdade OpenAQ, reference monitor NO₂: 6.5 µg/m³ · Fri 15:00 CO: 190 µg/m³ · Fri 15:00	0.6 km	3	Good
Unnamed sensor OpenAQ, low-cost sensor PM_2.5: 1.9 µg/m³ · Fri 17:00	1.4 km	11	Good
Unnamed sensor OpenAQ, low-cost sensor PM_2.5: 2.3 µg/m³ · Fri 17:00	2.5 km	13	Good

Air quality near Lisbon

US AQI right now. Cleanest nearby: Madrid (27); worst: Marseille (46). The tick on each bar is Lisbon, at 42.

Madrid 502 km NE 27 Good
Casablanca 589 km S 42 Good
Barcelona 1,006 km E 45 Good
Algiers 1,094 km E 31 Good
Marseille 1,317 km NE 46 Good
Lyon 1,388 km NE 40 Good

All 162 cities →

About this forecast

Forecast from CAMS Europe and global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (about 10 km inside Europe). Global runs update every 12 hours and European runs every 24 hours. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown. Nearby station measurements are independent observations, not adjustments to the forecast. The point forecast uses Open-Meteo’s CAMS products, including a separate carbon monoxide product; it can differ from the globe’s global grid. The AQI rates each hour on the US EPA scale, the same way the map colors it; official daily figures average over 24 hours (8 for ozone), so they can read lower after a short peak. Readings for 38.72°N, 9.14°W, valid 2026-11-13 17:00 UTC.