ProPublica reported on the pollution from a massive plant owned and operated by the South African chemical giant Sasol, which emits ethylene oxide and contributes to 39% of the excess estimated cancer risk in Mossville, according to our analysis. In January, regional and local officials conducted an inspection of the Sasol plant, and this week, the EPA issued a letter to the company regarding potential Risk Management Plan violations found during the inspection. Sarah Hughes, a spokesperson for Sasol, said that the company is "reviewing the inquiry and will respond to the agency within the time period requested."