DENVER (CBS4)- A new report shows that Colorado cities are among the most polluted in the U.S. Denver ranked 7th in the nation and Fort Collins came in 18th according to a report released by the American Lung Association.
Denver's ranking is even worse when it comes to ground-level ozone pollution.
Fort Collins showed some improvement with fewer unhealthy ozone days. Grand Junction ranked among the country's cleanest cities.
for more features.