The ban also expands and enforces existing laws banning styrofoam products and reducing plastic products.

Maryland is the first state to ban foam containers (though D.C. banned the material in 2016).

D.C. and Montgomery County will begin banning polystyrene foam food containers on Jan. 1, while Prince George’s County enacts its law in July.

Containers and cups containing polystyrene foam will be banned in D.C. by 2016, under new legislation passed yesterday.