HOUSTON (AP) - Environmental groups are accusing the largest oil refinery in the United States of violating thousands of federal air pollution laws during the last five years.

Sierra Club and Environment Texas have given Exxon Mobil Corp. official notice of their intent to sue over the Baytown, Texas, refinery. The 60-day notice is required under the Clean Air Act.

The environmental groups recently reached a $5.8 million settlement with Shell, forcing it to make changes to ensure clean operations. Last August, they sued Chevron Phillips.

The groups' attorneys say Exxon's plant has emitted 10 million pounds of illegal pollution in the last five years, including cancer-causing benzene and butadiene.

Exxon did not comment on the pending litigation.

(Copyright 2010 by The Associated Press. All Rights Reserved.)


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