Air Quality Lab — Porto, Portugal
Air Quality Profile
Porto reports an annual PM2.5 of 10.6 µg/m³. That's roughly double the WHO 2021 guideline but still far below the EU annual limit of 25 µg/m³.
Porto
Portugal
PortugalAnnual Average
FairWHO annual classification
10.6µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
1212 µg/m³ — Fair
1212 µg/m³ — Fair
1212 µg/m³ — Fair
1111 µg/m³ — Fair
9.59.5 µg/m³ — Good
9.89.8 µg/m³ — Good
1010 µg/m³ — Fair
1010 µg/m³ — Fair
9.39.3 µg/m³ — Good
1111 µg/m³ — Fair
9.89.8 µg/m³ — Good
1111 µg/m³ — Fair
Jan
Feb
Mar
Apr
May
Jun
1212 µg/m³ — Fair
1212 µg/m³ — Fair
1212 µg/m³ — Fair
1111 µg/m³ — Fair
9.59.5 µg/m³ — Good
9.89.8 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
1010 µg/m³ — Fair
1010 µg/m³ — Fair
9.39.3 µg/m³ — Good
1111 µg/m³ — Fair
9.89.8 µg/m³ — Good
1111 µg/m³ — Fair
Best months: May–Jun, SepWorst months: Jan–Mar
Good5–10 µg/m³Fair10–15 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Portugal
Porto: 10.6 µg/m³. Typical range in Portugal: 7.4–9.1 µg/m³. Low anchor: Ponta Delgada, 5.2 µg/m³.
85 cities tracked