Oregon DEQ: Portland Metro Area

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:	Wednesday, May 22, 2013
Data from:	12:00:00 PM to 1:00:00 PM Pacific Standard Time (PST)

Station	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

10093 SPR	29 Good O3	29	0.035	*	*	*	*	*	*
10139 SEL	18 Good O3	18	0.022	*	*	10	2.5	8	9.0
14152 SIS	23 Good O3	23	0.027	*	*	10	2.5	7	8.0
31009 SLR	20 Good O3	20	0.024	*	*	*	*	*	*

Click the station link under the "Station" header for additional Information

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

Air Quality Index - for stations in the Portland Metropolitan area

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.