(Francisco Kjolseth | Tribune file photo) People go about their day as the Salt Lake City Council, Salt Lake County, and the Utah Transit Authority gather on the North Temple Bridge/Guadalupe TRAX station in Salt Lake to announce Free Fare Friday to encourage greater use of transit during periods of poor air quality. On Friday, Dec. 22, no cash fares will be required on trains or buses in an effort to get infrequent or first-time riders to try out transit and use it more frequently.