参考词汇：能见度visibility

　　Dear Bill，

　　I'm glad to receive your letter. Thank you for your concern for the weather in my hometown and my health.I'm writing to tell you some details about it.

　　Would you like to tell me some more good ideas? I'm looking forward to your reply.

　　Yours truly，

　　Li Hua

　　范文　

　　Dear Bill，

　　I'm glad to receive your letter. Thank you for your concern for the weather in my hometown and my health. I'm writing to tell you some details about it.

　　The smog happened on October 20th and it lasted 3 days. Visibility was so low that you could only see things within ten meters. The PM2.5 level is 40 times what the World Health Organization considers safe.

　　Effective measures were taken to reduce the harm done by the heavy smog. Many people chose to stay at home rather than go outside. If they had to, they wore masks which could prevent the dirty air from being breathed in. Additionally, the number of private cars on the street decreased a lot as public transport was a wiser choice in that horrible weather. Some people even walked to work in the hope of reducing air pollution with their own effort.

　　Would you like to tell me some more good ideas? I'm looking forward to your reply.

　　Yours truly，

　　Li Hua

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