English composition about haze weather. About 100 words. Key points: ① Most people wear masks when they go out, and some even bring them to their pet dogs.

Air pollution is one of the most serious problems in the world.

With the development of industry, many factories produce terrible gases. Many people have private cars. They release harmful gases into the air. They make air pollution.

Air pollution has caused smog weather in many cities. It will lead to traffic accidents. It can also cause eye pain and breathing problems, and even cancer. It does great harm to people's health.

We should do something useful to make the air fresh. We can plant more trees. We'd better walk or ride a bike. Our government must pass laws against air pollution. It is our responsibility to prevent air pollution.