ExxonMobil's Baton Rouge Refinery in Baton Rouge, Louisiana is the fourth-largest oil refinery in the United States and twelfth-largest in the world, with an input capacity of 502,500 barrels (79,890 m3) per day as of January 1, 2016. The refinery is the site of the first commercial fluid catalytic cracking plant that began processing at the refinery on May 25, 1942.