TEXAS CITY, Texas (KTRK) -- An investigation is underway as Texas City Emergency Management is actively monitoring its air quality after an incident at a Valero facility.

The Texas City Office of Emergency Management says it is aware of what is described as "an upset" at the facility.

Texas City officials say that FM 519 to 605 S Loop is temporarily closed as a precaution.

The Texas City Office of Emergency Management provided a statement in an update on Saturday's incident.

"Valero is experiencing an upset, higher than normal emissions of SO2. Actively Air monitoring in the community with negative response on air monitors as of now 6:45 p.m. portions of the S Loop have been closed out of precaution."

According to the United States Environmental Protection Agency, sulfur dioxide is o

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