近年来,随着我国城市化进程的加快,人们对汽车的拥有率也在大幅提高,国民生活步入“汽车时代”。2013年国民经济和社会发展统计公报显示,年末全国仅私人轿车保有量就有6410万辆,较上年末增长20.8%。汽车数量的大幅度增长,造成城市交通的日益拥堵;车辆排出的大量尾气,也是造成PM2.5数值居高不下的一大“元凶”。对此,全国多个城市相继实施汽车限牌措 In recent years, with the acceleration of the process of urbanization in our country, people’s ownership of automobiles has also risen sharply, and national life has entered a “car era.” According to the Statistical Bulletin of the National Economic and Social Development in 2013, there were 64.1 million private-owned sedans nationwide at the end of the year, an increase of 20.8% over the previous year. A substantial increase in the number of cars, resulting in increasingly congested urban traffic; a large number of vehicles exhaust, but also caused a high PM2.5 value of a “culprit.” In response, a number of cities in the country have implemented car license measures