Mexico City has long been considered one of the most polluted cities in the world. The government has tried to clean its polluted air over the years by implementing vehicle emissions standards and inspection programs to cut down on old cars and other polluting vehicles. The city has also set its sights on improving public transportation and just this summer inaugurated a dedicated bus lane down one of its busiest streets. Producer Jana Schroeder climbed onboard the metrobus to find out how the new system is faring.