Most people -- 92% of the world's population -- live in places where the air quality doesn't meet World Health Organization guidelines.
원문출처 : http://www.cnn.com/2016/09/27/health/air-pollution-map-who/index.html
원문출처 : http://www.cnn.com/2016/09/27/health/air-pollution-map-who/index.html