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New Study Says Urban Trees Significantly Reduce Pollution

OPB | Sept. 04, 2014

THURSDAY: We'll talk to the author of a new Portland State University study that looks at air quality and tree cover in different Portland neighborhoods.

Portland Firm Tops Toxic Polluter List

OPB | Aug. 27, 2013

A study of the most toxic polluters in the U.S. ranked Portland-based Precision Castparts No. 1.

Environmental Update

OPB | May 29, 2012

A new study by Oregon's Department of Environmental Quality suggests that air quality is decreasing in the state. What are the causes?

To Burn or Not to Burn?

OPB | April 14, 2009

Should field burning be banned in Oregon?