每到傍晚,都可以见到成群结对的锻炼人群,他们或敲锣打鼓扭秧歌,或排成长队在音乐中慢跑。自发组织起来锻炼身体本是件好事,但专家提醒:路边锻炼留神尾气。有关资料显示,汽车尾气中含有大量的氮氧化物及硫化 Every evening, you can see groups of people who work in pairs, dancing drums and dancing yogi, or queuing up to jog in music. Self-organized exercise this is a good thing, but experts advise: the roadside exercise attentive exhaust. Relevant information shows that the car exhaust contains a lot of nitrogen oxides and sulfide