California leaders push new pollution rules after Trump strips key clean air authority

WHEN A PACKAGE ARRIVES at your door, it has likely traveled through a chain of ports, railyards and warehouses throughout the state. All those ships, trains and trucks leave behind a trail of diesel exhaust as they go, driving some of the highest asthma rates in communities. 

For decades, state and federal regulators have tried to clean that up. Now much of their authority is in doubt: the Trump administration revoked California’s authority to mandate electric vehicles and pulled back federal power to regulate greenhouse gas emissions — undermining California’s most effective tools.