Tehran passed an anti-pollution law on 20 April giving National Iranian Oil Refining and Distribution Company (NIORDC) three months to stop adding chemicals including ether and benzene to gasoline. State-owned National Petrochemical Company (NPC) has said it supplies NIORDC with 50,000-63,000 b/d of gasoline from its petrochemicals plants, as well as 44,000-56,600 b/d of chemicals for use as octane boosters. Iran first admitted using gasoline additives in 2010, as the previous government sought to make up for import volumes lost because of international sanctions (MEES, 28 February).