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Air pollution in many cities has been more and more serious.Especially in winter，we see a lot of foggy days in North China.PM 2.5 in the air can harm human health.PM 2.5 refers to small particles(顆粒) which are 2.5 micrometers(微米) or less in diameter.

What's the cause of PM 2.5 pollution?

Daily average particulate pollution (PM 2.5)

The 10 worst Chinese cities

The cities in North China are facing a more serious situation than the other parts.For example，Shenzhen and Guilin in the south of China are regarded as smog－free cities.While some cities，like Xingtai，Shijiazhuang and Baoding are among the most polluted cities.

1.What does PM 2.5 refer to?

______________________________________

2.What causes the most pollution in Beijing according to the chart？What percent is it?

___________________________________

3.Are Shenzhen and Guilin smog cities?

___________________________________

4.Which Chinese city is polluted most seriously according to the chart?

___________________________________

5.What will you do to reduce air pollution?

___________________________________

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