Texas Attorney General Greg Abbott is suing a Houston chemical company and two of its subsidiaries -- accusing them of releasing harmful pollutants into the air.
Officials with Lyondell Chemical denied the accusations.
According to the lawsuit, four chemical plants run by Lyondell and subsidiaries Equistar Chemicals and Millennium Petrochemicals released unauthorized harmful emissions.
The companies' facilities in La Porte, Channelview and Chocolate Bayou, south of Houston, are accused of releasing volatile organic compounds, nitrogen oxides and carbon monoxide.
The suit contends it happened over a long period of time and the companies did nothing about it.
Abbott's office is seeking civil penalties of between 50 and 25-thousand dollars for each day of each violation.
Lyondell spokesman David Harpole says there were some violations at the La Porte plant the company reported to state regulators.
He says the attorney general is trying to extract a penalty far in excess of what is prescribed by the state.