wearing face mask, high pollution mixed with fog, in Sarajevo, Bosnia. 戴口罩, 高污染與霧混合

A group of school children walk along the street waering face masks in Sarajevo, Bosnia. Because of high pollution mixed with fog, Sarajevo authorities say they closed down schools in the city while volunteers began distributing face masks to those who still decided to get out of the house despite experts' warnings.
December 23, 2015
http://www.voanews.com/media/photogallery/december-23-2015-day-in-photos/3115891.html