Air Quality Lab — San Diego, United States
Air Quality Profile
San Diego reports an annual PM2.5 of 9.2 µg/m³. That's close to the WHO 2021 annual guideline (5 µg/m³) and well inside historically healthy ranges.
San Diego
United States
United StatesAnnual Average
GoodWHO annual classification
9.2µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
9.79.7 µg/m³ — Good
1010 µg/m³ — Good
7.27.2 µg/m³ — Good
7.57.5 µg/m³ — Good
8.28.2 µg/m³ — Good
8.08.0 µg/m³ — Good
8.78.7 µg/m³ — Good
1111 µg/m³ — Fair
9.19.1 µg/m³ — Good
9.09.0 µg/m³ — Good
1111 µg/m³ — Fair
1111 µg/m³ — Fair
Jan
Feb
Mar
Apr
May
Jun
9.79.7 µg/m³ — Good
1010 µg/m³ — Good
7.27.2 µg/m³ — Good
7.57.5 µg/m³ — Good
8.28.2 µg/m³ — Good
8.08.0 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
8.78.7 µg/m³ — Good
1111 µg/m³ — Fair
9.19.1 µg/m³ — Good
9.09.0 µg/m³ — Good
1111 µg/m³ — Fair
1111 µg/m³ — Fair
Best months: Mar–Apr, JunWorst months: Aug, Nov–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 United States
San Diego: 9.2 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