As of August 2023, proposed legislation banning polystyrene has passed at least one legislative chamber in two states and one territory. In Connecticut, SB 118 passed the state Senate in April 2022, but died when the session ended. In Illinois, the state House passed HB2376 on March 21, 2023. 
The territory of the Northern Mariana Islands passed HB21-89 in its House of Representatives in 2020.
In September 2021, Florida introduced a proposed phaseout of polystyrene foam food packaging. Commissioner of Agriculture Nikki Fried, whose Florida Department of Agriculture and Consumer Services oversees food safety in Florida, proposed a rule to phase out polystyrene in 40,000 grocery stores, food markets, convenience stores, and gas stations that the agency regulates in Florida. The Florida Legislature will consider the proposed rule in 2022.