South Rim overlook, Big Bend National Park, 2012 CREDIT: flickr/ daveynin On Thursday the Environmental Protection Agency proposed a plan to reduce sulfur dioxide emissions that impede views, disturb health, and disrupt experiences at renowned national parks in Texas and Oklahoma. The requirements of the Clean Air Act are not being met at these federal lands, which include Big Bend and Guadalupe Mountains National Parks in Texas, and the EPA was forced to partially disapprove of Texas’ regional haze plan after it was found inadequate.