The ozone season in Dallas-Fort Worth lasts most of the year hotter weather can have an impact on ground-level ozone and the air quality.

As Chairman of the Environmental Regulation Committee, Landgraf will oversee matters related to air, land, and water pollution, industrial regulation, and environmental oversight by the Texas Commission on Environmental Quality (TCEQ).

Marathon said workers identified a "mist" leaking from its 501E reflux tower at a resid hydrotreating unit that resulted in emissions of harmful substances, including volatile organic compounds. The event lasted for about two hours. The company told Texas regulators that it isolated the tower and placed the unit on standby to stop the leak.