If you saw clean air, would you know it?

by timmel 9/21/2012 2:34 PM
The air we breathe is important to all of us. Some things that affect air quality are easy to see. Take for example, wildfires currently burning in Washington, Oregon and Idaho. These events create smoke plumes that are visible to the naked eye and on a larger scale in satellite imagery. But there are other things that can affect air quality that might not be as apparent in the course of our day-to-day lives. [More]