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New research led by the UC San Diego Institution of Oceanography confirmed what residents in San Diego's South Bay have been saying for years: Pollution from the Tijuana River affects not just water, but also air quality.Tuesday on Midday Edition, we hear more about the research and what it means for the health of South Bay residents.The Environmental Protection Agency and the U.S. International Boundary and Water Commission also met a key milestone recently to increase wastewater treatment for the region.Guest:Tammy Murga, environment reporter, KPBS |