Beijing has seen a lot of azure-blue skies since Aug 20, when the government began taking strict control of industrial and automobile emissions ahead of last week's military parade.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/how-beijings-sky-got-blue
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/china-daily
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution