Airpollutionbysourcesrangingfromcookingfirestoautosmok...
问题详情： Airpollutionbysourcesrangingfromcookingfirestoautosmokecontributedtoanestimatedsevenmilliondeathsworldwidein2012，theUNhealthagencysaidTuesday.“Airpollution,andwe，retalkingaboutbothindoorsando...