Air Quality Lab — Quelfes, Portugal
Air Quality Profile·
Quelfes reports an annual PM2.5 of 6.9 µg/m³. That's close to the WHO 2021 annual guideline (5 µg/m³) and well inside historically healthy ranges.
Quelfes
Portugal
PortugalAnnual Average
GoodWHO annual classification
6.9µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
7.07.0 µg/m³ — Good
8.38.3 µg/m³ — Good
9.09.0 µg/m³ — Good
5.45.4 µg/m³ — Good
5.95.9 µg/m³ — Good
6.56.5 µg/m³ — Good
7.67.6 µg/m³ — Good
7.87.8 µg/m³ — Good
5.95.9 µg/m³ — Good
6.56.5 µg/m³ — Good
5.65.6 µg/m³ — Good
6.96.9 µg/m³ — Good
Jan
Feb
Mar
Apr
May
Jun
7.07.0 µg/m³ — Good
8.38.3 µg/m³ — Good
9.09.0 µg/m³ — Good
5.45.4 µg/m³ — Good
5.95.9 µg/m³ — Good
6.56.5 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
7.67.6 µg/m³ — Good
7.87.8 µg/m³ — Good
5.95.9 µg/m³ — Good
6.56.5 µg/m³ — Good
5.65.6 µg/m³ — Good
6.96.9 µg/m³ — Good
Best months: Apr–May, NovWorst months: Feb–Mar, Aug
Good5–10 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Portugal
Quelfes: 6.9 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