Haze（雾霾）is a kind of air pollution in which the air is filled with dust and smoke. Haze stops people from breathing and seeing things clearly.     1     它对人们的健康很有害.

This kind of pollution comes from all kinds of sources, especially natural and man-made sources.     2     Many factories produce the smoke that seriously influences the air.

Haze has done great harm to our daily life. For example,     3     many traffic accidents happen because of the haze weather.

People have realized the great harm caused by the smoke and the importance of protecting the environment.     4     People all over the world are taking actions to keep the air clean. The government advises people to use public transportation to go to school or work.

Besides, we should pull together to plant more trees to improve the environment.     5     不要忘记我们仅仅只有一个地球。