So if you do ever come to China I strongly recommend buying a pm 2.5 mask to wear outside, especially in the winter.
What happens during winter? is it true it turn more smog because of high use of carbons?
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Yea man during the winter they burn more coal. Everyone has the heat on. Chinese people also tend to be a lot colder than us. They will be wearing coats and jackets when it's 90 degrees F outside.