Even when air pollution is at levels below air quality guidelines and regulatory limits, it can still pose a hazard to public health, a new study finds.
원문출처 : https://www.cnn.com/2019/08/21/health/air-pollution-deaths-study/index.html
원문출처 : https://www.cnn.com/2019/08/21/health/air-pollution-deaths-study/index.html