As per the data, the notified forest areas have illegal farmhouses, unauthorised colonies, JJ clusters and roads encroaching into the forestland.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/delhi-government-goes-digital-monitor-forest-land
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/high-court
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forests
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forest-encroachments