Above, a woman wears a mask decorated with a cartoon character on Nov. 13.
. A woman wears a cat-themed mask on Dec. 1.
. A woman walks through a shopping area on Dec. 8.
. A couple wears matching panda-themed masks near Tiananmen Square on Dec. 1.
. A man kisses his partner goodbye as they commute to work on Dec. 8.
. A woman wears a floral-style mask to protect herself from air pollution on Dec. 1.
. Police officers patrol in front of Tiananmen Square on Dec. 8.
. A woman wears a mask decorated with bows on Dec. 1.
. A man wearing a mask looks at his mobile on Dec. 8.
. A woman wears a plaid mask on Dec. 1.
. A child wears a protective mask with an animal figure on it on Dec. 8.
. People wear masks as they commute to work in heavy smog on Dec. 8.