Pollution

The most serlous result of air pollution is from its harmful effect, on human health. Both gases and particuiates burn people's eyes and irritate the lungs. Particulates can settle in 1ungs and worsen such respiratory diseases as asthma and bronchitis. Some expers even beIieve that particulates may cause such diseases as cancer emphysema and pneumonla.  

Air pollution also harm plans. Poisonoas gases in the air will turn into acid rain which spread over thou'ands of square  kilometers and restric the growth and even,ually kill nearly all kinds of plants. 

Polluted air can corrode such hard and strong materials as concrete and steel . which are widely used in building houses and constructions. In some cities. statues and other sculptares and art obiects outdoors have dislntegrated as a result of erosion by polluted air.

But advance in controlling exhaust from automobiles has been limited. Filters used inare not efficient in absorbing poisonous gase. and particulates To reduce hazardous. experts resort to new types of engines and new fuel.. The idea and prototypes of engincs have long been proposed and tested. Fuel in the turbine engine can be burned almostly completely , producing more power, releasing less unburned hydrocarbons and almost no carbon onoxide.