Salt Lake City, UT – As many as 5000 Utahans rallied at the State Capitol, demanding cleaner air with no more excuses. Every winter, pollution from oil refineries, Hill Air Force Base incinerators and Kennecott mines gets trapped low near the valley floors, creating toxic air and breathing troubles for the people. With what is known as ‘the inversion,’ Utah competes for the worst air in the country at this time of year.