(April 1, 2022, 8:05 AM EDT) -- HOUSTON — Chevron Phillips Chemical Co. LP has agreed to make an estimated $118 million in upgrades to resolve alleged violations of the Clean Air Act (CAA) and Texas air pollution control laws at three petrochemical manufacturing facilities in the state and pay a $3.4 million civil penalty, according to a consent decree filed March 9 in a federal court in Texas....