On today's Encore presentation of Access Utah, Sheri Quinn meets with Utah Physicians for a Healthy Environment, a group of over 300 medical doctors, last year declared an air-pollution public health emergency on Capitol Hill. The problem has been so bad that it drew a crowd of about 5,000 citizens to the State Capitol in late January, now regarded as the largest air-pollution-specific protest in U.S. history. Today, Dr. Roger Coulombe, professor of Toxicology at Utah State University, talks to Sheri Quinn about the side effects of bad in Cache Valley.