Valero Energy Corp. reported problems with a unit that led to excess emissions at its refinery in Port Arthur, Texas.

"Process unit upset resulted in excess flaring emissions," the refinery said in a filing it sent to the Texas Commission on Environmental Quality. "Operations followed procedures to mitigate potential impacts."

The emissions of sulfur dioxide began and ended Sunday afternoon, according to the statement from the 335,000-barrel-a-day refinery, which is located east of Houston.

Write to Dan Molinski at dan.molinski@wsj.com

(END) Dow Jones Newswires

August 08, 2016 11:34 ET (15:34 GMT)

Copyright (c) 2016 Dow Jones & Company, Inc.
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