According to air quality monitoring network SAFAR, PM2.5 levels are in severe category and are expected to remain in this category for more than three days, it said.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/delhi-facing-worst-smog-17-years-centre-science-and-environment
[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/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-meteorological-department-imd
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects