Air Quality Lab — Honolulu, United States
Air Quality Profile
Honolulu reports an annual PM2.5 of 5.0 µg/m³. That's below the WHO 2021 annual guideline of 5 µg/m³ — cleaner than most cities on the continent.
Honolulu
United States
United StatesAnnual Average
ExcellentWHO annual classification
5.0µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
4.44.4 µg/m³ — Excellent
4.94.9 µg/m³ — Excellent
5.05.0 µg/m³ — Excellent
5.95.9 µg/m³ — Good
5.25.2 µg/m³ — Good
5.15.1 µg/m³ — Good
5.05.0 µg/m³ — Excellent
4.54.5 µg/m³ — Excellent
5.05.0 µg/m³ — Excellent
5.35.3 µg/m³ — Good
4.64.6 µg/m³ — Excellent
4.94.9 µg/m³ — Excellent
Jan
Feb
Mar
Apr
May
Jun
4.44.4 µg/m³ — Excellent
4.94.9 µg/m³ — Excellent
5.05.0 µg/m³ — Excellent
5.95.9 µg/m³ — Good
5.25.2 µg/m³ — Good
5.15.1 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
5.05.0 µg/m³ — Excellent
4.54.5 µg/m³ — Excellent
5.05.0 µg/m³ — Excellent
5.35.3 µg/m³ — Good
4.64.6 µg/m³ — Excellent
4.94.9 µg/m³ — Excellent
Best months: Jan, Aug, NovWorst months: Apr–May, Oct
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
Honolulu: 5.0 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