Air Quality Lab — Portland, United States
Air Quality Profile
Portland reports an annual PM2.5 of 6.6 µg/m³. That's close to the WHO 2021 annual guideline (5 µg/m³) and well inside historically healthy ranges.
Portland
United States
United StatesAnnual Average
GoodWHO annual classification
6.6µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
6.06.0 µg/m³ — Good
6.56.5 µg/m³ — Good
6.66.6 µg/m³ — Good
6.06.0 µg/m³ — Good
5.25.2 µg/m³ — Good
5.55.5 µg/m³ — Good
5.25.2 µg/m³ — Good
4.64.6 µg/m³ — Excellent
9.39.3 µg/m³ — Good
1010 µg/m³ — Good
7.97.9 µg/m³ — Good
5.85.8 µg/m³ — Good
Jan
Feb
Mar
Apr
May
Jun
6.06.0 µg/m³ — Good
6.56.5 µg/m³ — Good
6.66.6 µg/m³ — Good
6.06.0 µg/m³ — Good
5.25.2 µg/m³ — Good
5.55.5 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
5.25.2 µg/m³ — Good
4.64.6 µg/m³ — Excellent
9.39.3 µg/m³ — Good
1010 µg/m³ — Good
7.97.9 µg/m³ — Good
5.85.8 µg/m³ — Good
Best months: May, Jul–AugWorst months: Sep–Nov
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 United States
Portland: 6.6 µg/m³. Typical range in United States: 6.4–7.8 µg/m³. Low anchor: Anchorage, 4.3 µg/m³. High anchor: Los Angeles, 13.8 µg/m³.
2,121 cities tracked