Air Quality Lab — Halden, Norway
Air Quality Profile·
Halden reports an annual PM2.5 of 5.1 µg/m³. That's close to the WHO 2021 annual guideline (5 µg/m³) and well inside historically healthy ranges.
Halden
Norway
NorwayAnnual Average
GoodWHO annual classification
5.1µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
6.36.3 µg/m³ — Good
6.86.8 µg/m³ — Good
5.65.6 µg/m³ — Good
3.83.8 µg/m³ — Excellent
4.14.1 µg/m³ — Excellent
6.16.1 µg/m³ — Good
4.64.6 µg/m³ — Excellent
5.25.2 µg/m³ — Good
3.63.6 µg/m³ — Excellent
4.54.5 µg/m³ — Excellent
4.94.9 µg/m³ — Excellent
6.26.2 µg/m³ — Good
Jan
Feb
Mar
Apr
May
Jun
6.36.3 µg/m³ — Good
6.86.8 µg/m³ — Good
5.65.6 µg/m³ — Good
3.83.8 µg/m³ — Excellent
4.14.1 µg/m³ — Excellent
6.16.1 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
4.64.6 µg/m³ — Excellent
5.25.2 µg/m³ — Good
3.63.6 µg/m³ — Excellent
4.54.5 µg/m³ — Excellent
4.94.9 µg/m³ — Excellent
6.26.2 µg/m³ — Good
Best months: Apr–May, SepWorst months: Jan–Feb, Dec
Excellent0–5 µg/m³Good5–10 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Norway
Halden: 5.1 µg/m³. Typical range in Norway: 4.3–5.8 µg/m³. Low anchor: Alta, 0.0 µg/m³. High anchor: Oslo, 6.5 µg/m³.
34 cities tracked