Barcelona — Air quality
Air quality
54.0
Moderate
Dust (PM10)
14.3
Low
Pollen
Mugwort
High
Hourly today
59.0
00:00
46.0
01:00
47.0
02:00
43.0
03:00
41.0
04:00
33.0
05:00
28.0
06:00
29.0
07:00
32.0
08:00
32.0
09:00
38.0
10:00
38.0
11:00
34.0
12:00
28.0
13:00
26.0
14:00
23.0
15:00
26.0
16:00
28.0
17:00
37.0
18:00
44.0
19:00
49.0
20:00
54.0
21:00
58.0
22:00
58.0
23:00
Coming days
Today
59.0
Moderate
Tomorrow
68.0
Bad
Monday
70.0
Bad
Tuesday
78.0
Bad
Wednesday
62.0
Bad
Pollutants
PM2.5
Fine particulate matter (PM2.5)
The smallest particles can reach the lungs and bloodstream.
8.7 µg/m³
Fair
· AQI 27.0
PM10
Particulate matter (PM10)
Larger dust particles; may irritate airways and eyes.
14.3 µg/m³
Good
· AQI 19.0
NO₂
Nitrogen dioxide
Mostly from traffic; higher levels make breathing harder.
48.8 µg/m³
Moderate
· AQI 54.0
O₃
Ground-level ozone
Forms in sunlight; may irritate throat and lungs.
23.0 µg/m³
Good
· AQI 8.0
SO₂
Sulfur dioxide
Industrial / heating source; can quickly bother people with asthma.
4.3 µg/m³
Good
CO
Carbon monoxide
Colorless, odorless gas; high levels cause headache and dizziness.
188.0 µg/m³
Good
AQI scale
≤20
Good
Feel free to air rooms; outdoor plans are fine.
≤40
Fair
Sensitive people should watch for symptoms.
≤60
Moderate
After long spells outdoors, take it easier.
≤80
Bad
Avoid prolonged outdoor exercise.
80+
Very bad
Stay indoors if you can.
Frequently asked questions
What does the air quality index (AQI) mean?
The European AQI rates air cleanliness on a 0–100+ scale from the main pollutants (PM2.5, PM10, NO₂, O₃, etc.). Lower is better.
What is the difference between PM2.5 and PM10?
PM2.5 is fine dust under 2.5 µm; PM10 is under 10 µm. Finer particles go deeper into the lungs.
When should I be careful?
At moderate or worse AQI, shorten outdoor exercise, keep asthma meds handy, and air rooms less during busy traffic hours.