Are air toxics only a problem in big cities like Portland?
According to various studies, high concentrations of air toxics also appear in other areas of the state, including most counties outside the Portland metropolitan area. The highest concentrations of air toxics are in Multnomah, Washington and Clackamas counties, where population and vehicle use are highest and where there is the most industrial and business activity. However, air toxics at levels of concern can be found anywhere in the state where there are motor vehicles, fuel burning, small businesses using chemicals and larger industrial activities.
