: Dioxins are a group of compounds that are persistent in the environment and can accumulate in the food chain. These are highly toxic and can cause reproductive problems, damage the immune system, and also cause cancer. Determine the maximum contaminant level (MCL) in units of (a) mg/L, (b) ppmm, and (c) ppbm, if according to the USEPA, the highest level of a Dioxin (2,3,7,8-TCDD) that is allowed in drinking water is 0.18 kg in 6 cubic kilometers.