Air Quality Lab — Viseu, Portugal
Air Quality Profile
Viseu reports an annual PM2.5 of 8.2 µg/m³. That's close to the WHO 2021 annual guideline (5 µg/m³) and well inside historically healthy ranges.
Viseu
Portugal
PortugalAnnual Average
GoodWHO annual classification
8.2µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
1212 µg/m³ — Fair
8.78.7 µg/m³ — Good
9.19.1 µg/m³ — Good
7.97.9 µg/m³ — Good
6.96.9 µg/m³ — Good
8.18.1 µg/m³ — Good
7.37.3 µg/m³ — Good
7.27.2 µg/m³ — Good
5.45.4 µg/m³ — Good
7.97.9 µg/m³ — Good
8.48.4 µg/m³ — Good
8.88.8 µg/m³ — Good
Jan
Feb
Mar
Apr
May
Jun
1212 µg/m³ — Fair
8.78.7 µg/m³ — Good
9.19.1 µg/m³ — Good
7.97.9 µg/m³ — Good
6.96.9 µg/m³ — Good
8.18.1 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
7.37.3 µg/m³ — Good
7.27.2 µg/m³ — Good
5.45.4 µg/m³ — Good
7.97.9 µg/m³ — Good
8.48.4 µg/m³ — Good
8.88.8 µg/m³ — Good
Best months: May, Aug–SepWorst months: Jan, Mar, Dec
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
Viseu: 8.2 µg/m³. Typical range in Portugal: 7.4–9.1 µg/m³. Low anchor: Ponta Delgada, 5.2 µg/m³. High anchor: Porto, 10.6 µg/m³.
85 cities tracked