2014-05-01 11:13:00 by Metro Networks, Inc.
The Portland area is getting a passing grade for air quality. The latest "state of the air" report card, issued by the American Lung Association, gives Multnomah County a grade of "B" for high-ozone days. The county gets a "C" for particle pollution over a given 24-hour period, and a passing grade for annual particle pollution. Washington and Clark counties each get an "A" for number of high-ozone days, but Clark gets a "D" for 24-hour particle pollution.