Duluth, MN (NNCNOW.com) --- The Environmental Protection Agency (EPA) has issued new rules aimed at cutting back on the pollution released into the air from Minnesota's taconite plants that contribute to haze in Northern Minnesota. According to our partners at Minnesota Public Radio, the EPA's new plan requires that six taconite facilities on the Iron Range and one in northern Michigan must install new equipment to cut back on the amount of nitrogen oxide and sulfur dioxide released into the air in order to limit the haze over the Boundary Waters and Voyageurs and Isle Royale National Parks. Back in 2012, the EPA claimed that the plan put forth by the Minnesota Pollution Control Agency to reduce haze in Northern Minnesota did not do enough to be effective. The EPA's new plan will give taconite plants 26 months to install the equipment. A spokeswoman for Cliffs Natural Resources, which operates three of Minnesota's plants, said the company is still reviewing the plan to see how it will affect operations. Posted to the web by Krista Burns Minnesota Public Radio News can be heard in Duluth on 100.5 FM or online at MPRnewsQ.org.