2023 Ohio train accident
Norfolk Southern personnel were first to respond on February 3. On February 4, they noticed water spillage into Sulphur Run and Leslie Run, and installed barriers to separate the floating pollutant. The U.S. Environmental Protection Agency (EPA) began monitoring air quality on February 3. According to the EPA, humans can smell butyl acrylate at a concentration lower than the screening level (exposure limit). The National Institute for Occupational Safety and Health (NIOSH) recommended exposure limit for butyl acrylate is time-weighted average 10 ppm (55 mg/m3).