HOUSTON (Reuters) - Total Petrochemicals & Refining USA reported pollution in excess of permitted levels from a coking unit at the company's 225,500-barrels-per-day Port Arthur, Texas refinery on Friday, a notice the plant filed with regulators showed.

The excess emissions resulted from a malfunction on wet gas compressors, according to the filing. The refinery said instrumentation technicians were working on the compressor controls.

(Reporting by Erwin Seba; Editing by Dale Hudson)