SmogRank / United States

Air quality in Diamond Head / Kapahulu / Saint Louis Heights estimated

Hawaii, United States. No ground monitor we can use is in this city, so these numbers are model estimates, not measurements.

≈ 6 µg/m³
Good

Estimated PM2.5, 7-day average to 2026-09-30, about 0.4× the WHO 24-hour guideline. 30-day average ≈ 4 µg/m³.

Model estimate from the Copernicus Atmosphere Monitoring Service (CAMS), scaled by 0.57 to match 3 measured cities within 300 km over the last week. Adjusted this way, a single day lands within ×1.5 of what a monitor would read about two times in three: a guide, not a measurement. Not ranked on SmogRank's boards.

Last 30 days, estimated

152026-09-01: ≈ 6 µg/m³ (estimate)09-012026-09-02: ≈ 3 µg/m³ (estimate)2026-09-03: ≈ 4 µg/m³ (estimate)2026-09-04: ≈ 5 µg/m³ (estimate)2026-09-05: ≈ 4 µg/m³ (estimate)2026-09-06: ≈ 3 µg/m³ (estimate)2026-09-07: ≈ 2 µg/m³ (estimate)2026-09-08: ≈ 4 µg/m³ (estimate)09-082026-09-09: ≈ 4 µg/m³ (estimate)2026-09-10: ≈ 4 µg/m³ (estimate)2026-09-11: ≈ 4 µg/m³ (estimate)2026-09-12: ≈ 5 µg/m³ (estimate)2026-09-13: ≈ 4 µg/m³ (estimate)2026-09-14: ≈ 4 µg/m³ (estimate)2026-09-15: ≈ 3 µg/m³ (estimate)09-152026-09-16: ≈ 2 µg/m³ (estimate)2026-09-17: ≈ 3 µg/m³ (estimate)2026-09-18: ≈ 3 µg/m³ (estimate)2026-09-19: ≈ 4 µg/m³ (estimate)2026-09-20: ≈ 5 µg/m³ (estimate)2026-09-21: ≈ 6 µg/m³ (estimate)2026-09-22: ≈ 4 µg/m³ (estimate)09-222026-09-23: ≈ 4 µg/m³ (estimate)2026-09-24: ≈ 5 µg/m³ (estimate)2026-09-25: ≈ 5 µg/m³ (estimate)2026-09-26: ≈ 5 µg/m³ (estimate)2026-09-27: ≈ 8 µg/m³ (estimate)2026-09-28: ≈ 5 µg/m³ (estimate)2026-09-29: ≈ 6 µg/m³ (estimate)09-292026-09-30: ≈ 6 µg/m³ (estimate)

Daily means, UTC days. Dashed line: WHO 24-hour guideline (15 µg/m³).

Measured cities nearby

CityDistance7-day average
Honolulu6 km4.8 µg/m³
Makakilo / Kapolei / Honokai Hale30 km–
Kahului145 km6.4 µg/m³
Kīhei153 km4.9 µg/m³

Estimates contain modified Copernicus Atmosphere Monitoring Service information 2026. How estimates are made.