Center for Public Integrity : "There are 141 oil refineries in the United States. Where they are clustered — east and south of Houston, south of Los Angeles, northeast of San Francisco — they are prodigious sources of air pollution and inflict a sort of low-grade misery — rank odors, bright flares, loud noises — on their neighbors.
They also pose an existential threat, as evidenced by the more than 500 refinery accidents reported to the U.S. Environmental Protection Agency since 1994. The Anacortes disaster occurred five years after the BP refinery in Texas City, Texas, blew up, killing 15 workers and injuring 180. It came two years before a fire at the Chevron refinery in Richmond, California, sent a plume of pungent, black smoke over the Bay Area, and five years before an explosion at the ExxonMobil refinery in Torrance, California, nearly unleashed a ground-hugging cloud of deadly acid into a city of almost 150,000 people."