Maryland embraces gradual transition to zero-emission trucks and buses

In a significant step toward eliminating toxic air pollution, Maryland lawmakers have approved a measure requiring that, year by year, manufacturers ensure that zero-emission vehicles make up a growing share of the trucks and buses sold in the state. Yet some public health advocates fret that the wording of the legislation will allow the state to drag its feet for a year or more if it finds that the infrastructure for electric vehicles is inadequate.