Phillips 66 (PSX) reported above-normal flaring of gas emissions at its refinery in the Los Angeles area of southern California.

"Over 500 pounds of sulfur dioxide was released into the atmosphere from flaring due to unknown cause," the refinery said in a statement to the California Emergency Management Agency, noting an investigation into the cause has begun. It said the emissions began Tuesday night and were ongoing.

Phillips has two refinery facilities in the Los Angeles area, one in Carson and the other nearby in Wilmington, that together have a crude capacity of 139,000 barrels a day, according to its website. The flaring incident happened at the Carson plant.

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

(END) Dow Jones Newswires

January 22, 2020 08:37 ET (13:37 GMT)