![]() ![]() In doing so, PM2.5 has the ability to affect a variety of organs, such as the heart and brain, among others. This is because PM2.5 describes matter so small that it’s able to cross the natural barriers in our airways and enter the bloodstream. Unlike gases and other commonly measured air pollutants, PM2.5 is defined by its size rather than its chemical makeup. PM2.5 includes a combination of airborne particulate matter including ash, soot, dust, dirt, pollen, and chemicals that measure 2.5 microns in diameter or smaller. Eugene averages 6.2 unhealthy PM2.5 days per year, nearly double the federal allowance set at 3.2 unhealthy days per year. When it comes to clean air, short-term particle pollution (PM2.5) is of primary concern in Eugene, Oregon. ![]()
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