In a twist, Colorado asks EPA to lower state's air rating

FILE - In this Thursday, July 11, 2019, file photograph, southbound Interstate 25 traffic lanes bog down to a crawl at the interchange with Interstate 70 just north of downtown Denver. On Friday, Sept. 6, 2019, the U.S. Environmental Protection Agency held a hearing to decide whether to lower the ozone status of Denver and eight other northern Colorado counties from "moderate" to "serious," a move that would force the state to take action to clean the air but which businesses have voiced objections over meeting any possible regulatory changes.