In its 'War on Pollution:'#China's most populated cities had the biggest declines in concentrations of #PM25: Beijing - 35%; Shijiazhuang - 39%; Baoding - 38%. Analysis from Director Michael Greenstone: https://www.nytimes.com/2018/03/12/upshot/china-pollution-environment-longer-lives.html?action=click&contentCollection=upshot&contentPlacement=1&module=package&pgtype=sectionfront®ion=rank&rref=collection%2Fsectioncollection%2Fupshot&version=highlights …pic.twitter.com/12KCCyyJFN