SmogRank / World / North America / United States / Hawaii

Most polluted cities in Hawaii, United States

6 measured cities, this year; 1 above the WHO annual guideline. Worst: Kailua-Kona at 6.6 µg/m³, #2,308 in the world.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

Hawaii: 6 measured cities#5 Hawaiian Paradise Park: 3.6 µg/m³#6 Hilo: 3.6 µg/m³#4 Kahului: 3.9 µg/m³#3 Kīhei: 4.0 µg/m³#2 Honolulu: 4.2 µg/m³#1 Kailua-Kona: 6.6 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Kailua-Kona 0% 0.75%0
Every measured city in Hawaii, United States, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Kailua-Konalast full day 29 Sept 0%
  2. 2Honolulu 0%
  3. 3Kīheilast full day 3 Oct 0%
  4. 4Kahuluilast full day 2 Oct 0%
  5. 5Hawaiian Paradise Park 0%
  6. 5Hilo 0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Hawaii cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
East Honolulu≈ 4 µg/m³Good
Pearl City≈ 5 µg/m³Good
Joint Base Pearl Harbor Hickam≈ 5 µg/m³Good
Aliamanu / Salt Lakes / Foster Village≈ 5 µg/m³Good
Kailua≈ 6 µg/m³Good
Waipahu≈ 5 µg/m³Good
ʻEwa Gentry-West Loch≈ 5 µg/m³Good
Kaneohe≈ 4 µg/m³Good
Makiki / Lower Punchbowl / Tantalus≈ 5 µg/m³Good
Mililani Town≈ 5 µg/m³Good
Manoa≈ 5 µg/m³Good
‘Ewa Gentry≈ 5 µg/m³Good
Wahiawā-Whitmore≈ 5 µg/m³Good
ʻEwa Beach-Iroquois Point≈ 5 µg/m³Good
Mililani Mauka≈ 5 µg/m³Good
Makakilo-Makaīwa Hills-Kunia≈ 5 µg/m³Good
Kalihi Valley≈ 5 µg/m³Good
Schofield-Wheeler≈ 5 µg/m³Good
Waikīkī≈ 5 µg/m³Good
Diamond Head / Kapahulu / Saint Louis Heights≈ 5 µg/m³Good
Niu Valley≈ 4 µg/m³Good
Makakilo≈ 5 µg/m³Good
Mililani Mauka / Launani Valley≈ 5 µg/m³Good
Wahiawā≈ 5 µg/m³Good
‘Ewa Beach≈ 5 µg/m³Good
Schofield Barracks≈ 5 µg/m³Good
Kuliouou - Kalani Iki≈ 4 µg/m³Good
Koolauloa≈ 5 µg/m³Good
Kapolei Villages≈ 5 µg/m³Good
Makakilo City≈ 5 µg/m³Good
Wailuku≈ 4 µg/m³Good
Kapolei≈ 5 µg/m³Good

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SmogRank, most polluted cities in Hawaii, United States, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/us/region/hawaii?w=year.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.