Five coal plants in Indiana ranked in the top 100 for both toxic and greenhouse gas pollution — more than any other state.
Gov. Mike Pence says the EPA's plan to reduce CO2 emissions 30 percent by 2030 could cost Indiana thousands of jobs.
The ruling would require 28 states including Indiana to reduce their emissions that impact other states.
Indiana ranks particularly high in chromium and nickel. Energy companies say they are taking steps to decrease their emissions.