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On the third anniversary of the Torrance Refinery explosion, activist gathered to protest the continued use of a chemical they say is toxic.

The refinery says that, in the past, a court-appointed safety expect found Modified Hydrofluoric Acid was safer than any alternative. But the South Coast Air Quality Management District is weighing a proposal that would ban the chemical.

Lauren Lyster reports for the KTLA 5 Morning News on Feb. 17, 2018.