Theairpollutionwasso的甄选

问题详情：TheairpollutionwassobadinHarbin,inChina,onOctober21,2013thatthecityhadtocloseroadsandschools,andcancel hundredsofflightsfromitsairport.Newsreportssaidthesmog(amixtureofsmokeandfog)wassothickt...