AIR POLLUTION: 4 states sue EPA over delayed notices on SO2 compliance Jeremy P. Jacobs, E&E reporter Published: Friday, September 20, 2013 Four states have sued U.S. EPA for failing to determine whether they're meeting new sulfur dioxide air limits. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.