Smog,a kind of air pollution,has frequently appeared in our major cities.
I am writing to expressing my views concerning smog weather the harm,and I will try to make some useful suggestions here.
In my opinion,smog weather from exhaust emission.You would be wise to take the following action:You should go bout on mask.
I hope you will find these suggestions useful,and I will ready to discuss this matter with further details.
Thank very much!