An official website of the State of Oregon Here's how you know » An official website of the State of Oregon »
You are here:
The Environmental Protection Agency defines air pollution as "The presence of contaminants or pollutant substances in the air that interfere with our health or welfare, or produce other harmful environmental effects."
A .gov website belongs to an official government organization in the United States.
A lock icon ( ) or https:// means you’ve safely connected to the .gov website.
Your browser is out-of-date! It has known security flaws and may not display all features of this and other websites. Learn how
×