The ban went into effect July 1 after lawmakers voted in 2013 to approve it unless a yearlong inquiry found the foam could be effectively recycled. An industry group of manufacturers, recyclers and restaurant-owners then sued, arguing that the ban was based on politics, not policy, and that recycling was feasible.
The environmental initiative was spearheaded by former Mayor Michael Bloomberg, an independent, and supported by current Mayor Bill de Blasio, a Democrat.
But state Supreme Court Judge Margaret Chan ruled that Department of Sanitation Commissioner Katheryn Garcia didn't properly take into account industry estimates of the market and recycling opportunities generated during the yearlong review period when she decided that plastic foam couldn't be recycled economically and in an environmentally friendly way.