More than 100 cities are planning to take part in a car-free day, during which cars will be barred from some areas and officials will leave behind their black sedans in favor of public transport. No-car events will be held around the world on September 22, reflecting growing concerns about congestion and pollution, the Financial Times reported. China is the world's second-largest auto market, and officials say the growth in car transport has gone beyond the ability of the current infrastructure or the environment to sustain it. "City government leaders must set an example in taking part in this activity by going to work by public transport, walking or riding bicycles," state media said. Although the one-off event will not have a long-term impact, the cities participating have agreed to put into practice at least one new green transport policy.