On October 17 last year, the EPCA had imposed the measures under the Graded Response Action Plan (GRAP) to combat pollution in the city ahead of the winter.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ban-diesel-generators-brick-kilns-lifted-delhi-air-improves-environment-pollution-control
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/ndtv
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-pollution-control-authority-epca
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sunita-narain
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diesel