text: In bogota, Columbia , an event took place to help cleanse the air in columbia. Two Colombian cities, Cali and Valledupar, joined the event for the first time. "It's a good opportunity to take away stress and lower air pollution," said a buisnessman Carlos Arturo Plaza as he rode a two-seat bicycle with his wife. A study found that the driving of young age people decreased 23 percent between 2001 and 2009. Younger people may be getting more atheltic and excersising by running or riding a bike.