BAYTOWN, Texas—Two environmental groups are suing the Chevron-Phillips chemical company.

The lawsuit claims the company’s Cedar Bayou plant has repeatedly violated the Clean Air Act.

The facility is located off I-10 in Baytown, about 25 miles east of downtown Houston.

The Sierra Club and Environment Texas claim the plant has released more than 1 million pounds of pollutants into the air since 2003, in violation of legal limits.

An attorney representing the environmentalists said both sides plan to meet to discuss a settlement.