Air Quality Studies
Sometimes Ecology conducts special air quality studies to better understand air quality issues in a specific location. Here is information about recent air quality studies.
Yakima Air Winter Nitrate (YAWN) Study (April 2014)
About 25 percent of Yakima’s winter PM2.5 is made up of nitrate in the air (aerosol nitrate). This is higher than anywhere
else in the state. Researchers at Washington State University and Central Washington University studied
Yakima’s air to better understand high nitrate levels. The study involved monitoring different air quality
properties over three weeks in January 2013. The most likely cause of high nitrate levels was found to be
the interaction of
2012 Airport Lead Study (June 2013)
In December 2010, EPA revised the monitoring requirements for measuring lead in the air. The amendments
required eight states to conduct one-year monitoring studies at airports with lead emission inventories
between 0.50 and 1.0 tons per year. EPA identified two airports in Washington that met the study criteria:
Auburn Municipal and Harvey Field.
Sources of Fine Particles in the Tacoma-Pierce County PM2.5 Nonattainment Area
In December 2009, EPA classified the Tacoma-Pierce County area as a nonattainment area because fine
particle (PM2.5) pollution levels did not meet healthy limits from 2006-2008. Ecology was required to
develop an air quality plan called a State Implementation Plan (SIP) showing what actions would be taken
to control air pollution in the area. Wood smoke was found to contribute more than half of the PM2.5 during
the winter. Fine particles from wood smoke and industry have declined each year since 2006.
Copyright © Washington State Department of Ecology|
Privacy Notice | Site Info | Accessibility | Contact the web team |