SmogRank / United States / Hawaii / Kahului
Kahului, month by month
Kahului has a measured daily mean on 1,270 days since 1 January 2023. Its worst month was February 2023, at 34 US AQI (6.1 µg/m³), 1,005th of 1,129 cities on that month's world ranking. Its cleanest was October 2023, at 13 US AQI (2.4 µg/m³). 2025 averaged 23 US AQI (4.1 µg/m³), against 23 US AQI (4.2 µg/m³) in 2024.
Every month since 2023
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
Months without a mean, and why
1 month
| Month | Why |
|---|---|
| Aug 2026 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Kahului's worst months
| Month | US AQI | World rank |
|---|---|---|
| February 2023 | 346.1 µg/m³ | 1,005thof 1,129 |
| February 2026 | 315.5 µg/m³ | 2,522ndof 2,866 |
| January 2026 | 295.2 µg/m³ | 2,309thof 2,617 |
| April 2024 | 285.1 µg/m³ | 1,941stof 2,520 |
| March 2025 | 285.0 µg/m³ | 2,490thof 2,862 |
| March 2023 | 274.8 µg/m³ | 814thof 911 |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Kahului's worst days
| Day | US AQI |
|---|---|
| 1 Jan 2024 | 10637.6 µg/m³ |
| 28 Feb 2025 | 6717.6 µg/m³ |
| 27 Feb 2025 | 6215.0 µg/m³ |
| 5 Jan 2025 | 5612.0 µg/m³ |
| 4 Jan 2025 | 5511.3 µg/m³ |
| 3 Apr 2025 | 5511.3 µg/m³ |
| 22 Feb 2023 | 5310.3 µg/m³ |
| 29 Jan 2026 | 5310.0 µg/m³ |
| 1 Mar 2025 | 529.9 µg/m³ |
| 11 Feb 2026 | 519.3 µg/m³ |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Kahului, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/kahului/history (accessed 12 Oct 2026).
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.
Kahului now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).