<human>: I've heard that the EPA is going to release a list of the most polluting companies. How will this help the environment?
<bot>: Well, it’s true that the EPA has been working on a new rule called the Clean Air Act Mercury and Air Toxics Standards (MATS), which would require coal-fired power plants to reduce emissions of mercury and other air pollutants. The proposed standards are expected to be finalized in June 2020.