1月10日以来,我国东北、华北、长三角、中部和西南部地区相继出现空气重污染天气,PM2.5浓度指数多次“爆表”。北京更是深陷雾霾之中,摇身一变成为“雾都”。各地的空气质量检测数据引发舆论热议,空气质量问题再一次成为全民关注的焦点。专家表示,汽车尾气排放是造成空气污染的重要原因 Since January 10, heavy-polluted air has appeared successively in the northeast, north China, the Yangtze River Delta, central and southwestern regions of China, and the PM2.5 concentration index has been on many occasions. Beijing is more in the haze, transformed into “fog are ”. Air quality testing data around the country led to hot media, air quality issues once again become the focus of public concern. Experts said that vehicle exhaust is an important cause of air pollution