problem in the biggest city in brazil so sao paulo is switching to battery powered buses as gabriel eelizondoorts. >> reporter: it's another typical busy morning at the main bus terminal in the sao paulo suburbs. but some of these commuters will be riding in to work on anything but a typical form of transportation. this is an all electric, battery powered public bus. one of several going through a trial run in sao paulo. the first of its kind to be put in to operation in south america and only a small handful of cities armed the world. in the first month they were put in to operation, more than 100,000 passengers used the buses. >> translator: it doesn't make pollution, it's faster, and doesn't make noise. >> translator: it runs entirely on rechargeable lithium ion batteries. four times a day the bus is quickly fueled up on the electricity at this charging dock. >> reporter: there are more than 20,000 regular diesel powered buses like this in the city of sao paulo. one of the biggest fleets of buses of any city in the world. right now, less than 2% are battery powered. but if this e-bus exper