A coalition of more than a dozen environmental groups on Thursday sued the Trump administration for rolling back chemical disaster prevention regulations, a move they say has endangered millions of lives.

“By killing these critical protections, millions of people living near chemical facilities in the United States are put in harm’s way,” said the coalition represented by environmental advocacy organization Earthjustice. “We are fighting for the lives and safety of our families and workers. Our lives are more valuable than the bottom line of a few chemical barons.”

The rollback of the Obama-era Chemical Disaster Rule was finalized by the Environmental Protection Agency (EPA) last month despite urgent warnings that the decision would put the health and safety of people who live near chemical plants at risk. The EPA’s new rule, which the environmental coalition said is illegal, took effect Thursday morning.

Last month, just a week after the rollback was announced, a TPC Group chemical plant in Port Neches, Texas exploded and spewed toxic gas into the air, prompting authorities to issue an order urging 50,000 city residents to evacuate. Environmentalists cited the incident as evidence of the dangers of deregulation and the need for stronger disaster prevention rules.