SmogRank / United States / Hawaii / Kailua-Kona
Kailua-Kona, month by month
Kailua-Kona has a measured daily mean on 1,259 days since 1 January 2023. Its worst month was February 2025, at 48 US AQI (8.6 µg/m³), 1,437th of 2,633 cities on that month's world ranking. Its cleanest was October 2023, at 12 US AQI (2.1 µg/m³). 2025 averaged 31 US AQI (5.5 µg/m³), against 18 US AQI (3.3 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
3 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 11 with no readings from the monitor. |
| Mar 2023 | 10 of 31 days measured; a month needs 22. The others: 1 with readings for part of the day (a day needs 18 hours), 20 missing from OpenAQ's archive. |
| Feb 2023 | 1 of 28 days measured; a month needs 20. The others: 2 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Kailua-Kona's worst months
| Month | US AQI | World rank |
|---|---|---|
| February 2025 | 488.6 µg/m³ | 1,437thof 2,633 |
| May 2026 | 447.9 µg/m³ | 1,332ndof 2,874 |
| September 2026 | 427.5 µg/m³ | 1,125thof 2,997 |
| March 2025 | 417.4 µg/m³ | 2,035thof 2,862 |
| June 2026 | 397.1 µg/m³ | 1,423rdof 2,497 |
| January 2023 | 397.0 µg/m³ | 856thof 1,261 |
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.
Kailua-Kona's worst days
| Day | US AQI |
|---|---|
| 26 Dec 2024 | 7220.6 µg/m³ |
| 25 Dec 2024 | 7119.9 µg/m³ |
| 3 Apr 2025 | 7019.4 µg/m³ |
| 6 Feb 2025 | 6919.0 µg/m³ |
| 1 Mar 2025 | 6717.8 µg/m³ |
| 15 Sept 2023 | 6717.6 µg/m³ |
| 14 Sept 2023 | 6617.3 µg/m³ |
| 27 Feb 2025 | 6617.2 µg/m³ |
| 28 Feb 2025 | 6617.2 µg/m³ |
| 7 May 2026 | 6617.0 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, Kailua-Kona, United States, 1 Jan 2023 – 29 Sep 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/kailua-kona/history (accessed 13 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.
Kailua-Kona now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 03:07 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).