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.
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
PM2.5: 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: http://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.).