Just because the city is not covered in smog does not mean pollution levels are down. On the contrary, alarm bells should be ringing and ringing loud.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/winter-long-gone-delhis-air-still-absolutely-poisonous
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/zee-news
[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/air-quality-monitoring
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bharat-stage-vi
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution