Oregon DEQ: AQI

The Air Quality Index (AQI) is a color-coded tool which shows air pollution levels. Green is good, yellow is moderate, orange is unhealthy for sensitive groups, and red is unhealthy for all groups. DEQ issues Air Pollution Advisories when we forecast air pollution levels above the yellow, or moderate, AQI category and remain there for more than 72 hours.

The AQI for particulate matter (both PM_2.5 and PM₁₀) is based on the average of the previous 24 hours of pollution levels. Particle pollution is often highest during the coldest times of the day, typically in the evening and early morning.

Air Quality Index calculated for:

Monday, May 20, 2013

Data from:

9:00:00 PM to 10:00:00 PM Pacific Standard Time (PST)

Monitoring Area	Current Hourly AQI	Ozone		Carbon Monoxide		PM-2.5		PM-10
		8-Hour		8-Hour		24-Hour		24-Hour
		AQI	ppm	AQI	ppm	AQI	µg/m³	AQI	µg/m³

Albany	16 Good PM2.5	*	*	*	*	16	3.9	10	11.0
Applegate Valley	11 Good PM10	*	*	*	*	11	2.7	11	12.0
Baker City	15 Good PM2.5	*	*	*	*	15	3.7	12	13.0
Beaverton	16 Good PM2.5	*	*	*	*	16	3.9	9	10.0
Bend	41 Good O3	41	0.049	*	*	12	2.9	12	13.0
Burns	14 Good PM2.5	*	*	*	*	14	3.3	12	13.0
Cave Junction	12 Good PM2.5	*	*	*	*	12	2.9	11	12.0
Corvallis	12 Good PM2.5	*	*	*	*	12	2.8	9	10.0
Enterprise	14 Good PM2.5	*	*	*	*	14	3.3	12	13.0
Grants Pass	12 Good PM10	*	*	*	*	11	2.6	12	13.0
Hermiston	35 Good O3	35	0.042	*	*	*	*	*	*
Hillsboro	16 Good PM2.5	*	*	*	*	16	3.9	9	10.0
John Day	11 Good PM2.5	*	*	*	*	11	2.6	10	11.0
Klamath Falls	13 Good PM2.5	*	*	*	*	13	3.2	12	13.0
La Grande	14 Good PM10	*	*	*	*	12	2.8	14	15.0
Lakeview	13 Good PM2.5	*	*	*	*	13	3.2	10	11.0
Medford	15 Good PM2.5	*	*	*	*	15	3.7	13	14.0
Pendleton	12 Good PM2.5	*	*	*	*	12	2.9	10	11.0
Portland	39 Good O3	39	0.047	*	*	19	4.5	9	10.0
Prineville	13 Good PM10	*	*	*	*	11	2.6	13	14.0
Roseburg	13 Good PM2.5	*	*	*	*	13	3.1	12	13.0
Salem	38 Good O3	38	0.046	*	*	18	4.4	10	11.0
Shady Cove	11 Good PM10	*	*	*	*	11	2.7	11	12.0
Sisters	11 Good PM2.5	*	*	*	*	11	2.7	3	3.0
Sweet Home	11 Good PM2.5	*	*	*	*	11	2.7	9	10.0
The Dalles	13 Good PM2.5	*	*	*	*	13	3.2	12	13.0

To access monitoring Station AQI's for the Metropolitan Areas click the city name link under "Monitoring Area".

Additional Oregon AQI's:

Eugene - Lane Regional Air Protection Agency (LRAPA)
Ontario Area / Treasure Valley, Idaho (links to Idaho DEQ)
Vancouver, WA - SouthWest Clean Air Agency (SWCAA)

The DEQ Data System always runs on Pacific Standard Time (PST). This creates the appearance of a one hour time shift during the months of May through October. The data displayed is the most current data available.

All readings are preliminary (unvalidated). All values are subject to change following final review.

New readings will be available at approximately 10 minutes past the hour. "Refresh" or "Reload" the page to see the most current values.

PPM stands for parts per million, a measurement of the pollution concentration in the air.

ug/m3 stands for micro grams per cubic meter.

The U. S. Environmental Protection Agency's scale for rating air quality is shown in the table below. The AQI breakpoints have been recently updated to match the new AQI definitions at the EPA's AIRNow website.

Air Quality Rating	Air Quality Index (AQI)	PM2.5 24-hour Average (µg/m³)	8-hour Ozone Concentration (ppm)	Carbon Monoxide 8-hour average (ppm)
GOOD	0-50	0.0-12.0	0.000-0.059	0.0-4.4
MODERATE	51-100	12.1-35.4	0.060-0.075	4.5-9.4
UNHEALTHY for Sensitive Groups	101-150	35.5-55.4	0.076-0.095	9.5-12.4
UNHEALTHY	151-200	55.5-150.4	0.096-0.115	12.5-15.4
VERY UNHEALTHY	201-300	150.5-250.4	0.116-0.374	15.5-30.4
HAZARDOUS	>300	>250.5	>0.375	>30.4