But levels of the dangerous pollutant PM 2.5 saw a spike from last year
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/emission-firecrackers-less-diwali-study
[2] http://admin.indiaenvironmentportal.org.in/category/author/damini-nath
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diwali
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/festival
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-standards
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control