Hawaii Ambient Air Quality Data

Explanation of Website

This website displays near real-time air quality data from specific stationary monitoring stations on a continuous basis. Since it takes time to poll the monitoring stations, data is normally displayed within one hour after collection.

Always check the time and date of the air quality data. The time displayed represents the end time of the hourly average. For example: 11 a.m. means the hourly average reading from 10 a.m. to 11 a.m.

Click here to view the Hawaii Ambient Air Quality Data

Data Disclaimer

The data on these web pages is preliminary and unofficial. It awaits review and validation by qualified staff. The data may be revised or invalidated after review. The Department makes every effort to assert the validity and integrity of the data, but data can be affected by equipment malfunctions, technical difficulties, and other unforeseen circumstances.

Reading the Website

Pollutants: None of the stations monitor for all pollutants.

CO: carbon monoxide

H₂S: hydrogen sulfide

NO₂: nitrogen dioxide

O₃: ozone

PM_2.5: fine particulate matter, 2.5 microns (size) or smaller

PM₁₀: particulate matter, 10 microns (size) or smaller

SO₂: sulfur dioxide

Pollutant concentrations: These are shown as hourly averages.

ppm: parts per million

ppb: parts per billion

μg/m³: micrograms per cubic meter of air for particulates.

Wind: Tables display wind direction and speed in numbers.

WD: wind direction, in degrees.

0 = north

90 = east

180 = south

270 = west

WS: wind speed, in miles per hour.

Time: The time is always stated as Hawaiian Standard Time.

AQI: Air Quality Index is maintained by the U.S. Environmental Protection Agency as a uniform indicator of the daily air quality and a general guide for the public. For more information about the Air Quality Index, please see: https://www.airnow.gov/

For more information about air quality and air quality standards, please see: https://www.epa.gov/aboutepa/about-office-air-and-radiation-oar#oaqps/

For air quality data questions contact the Clean Air Branch at [email protected] or (808) 586-4200. For technical questions concerning the data presented on this webpage, contact the Air Quality Monitoring Section at [email protected] or (808) 453-6620 (M – F 8:00 a.m. to 4:30 p.m.).