ThousandsofliveswouldbesavedeachyearifAmericancountiesmetstandardssetbytheAmericanThoracicSociety(ATS)forthetwomostimportantairpollutants,accordingtoanewreport.
A signal failure was the cause of a subway collision in South Korea, indicating the accident came from human errors, the Seoul government office said Saturday.
简体中文
