Translation of "Fumes" in Chinese

Before now, when you thought of a city, you thought of crowded streets, parking problems, traffic jams, queues, noise and fumes.

以前，想到城市，人们就会想到拥挤的街道、紧缺的车位、拥挤的交通、排得老长的队伍以及噪音和烟雾。