Valero Energy Corp. (VLO) reported an operational snag and gas emissions Monday at a unit of its refinery in Port Arthur, Texas.

"Process unit upset," the refinery said in a filing sent to the Texas Commission on Environmental Quality. "Followed procedures to minimize emissions and mitigate upset."

It said the emissions of sulfur dioxide and other gases lasted for about an hour Monday.

The 335,000-barrel-a-day refinery is located east of Houston.

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

(END) Dow Jones Newswires

November 21, 2016 16:22 ET (21:22 GMT)

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