The findings were part of a study conducted by the National Environmental Engineering Research Institute.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/bulk-delhi%E2%80%99s-pollution-comes-neighbouring-states
[2] http://admin.indiaenvironmentportal.org.in/category/author/jacob-koshy
[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/national-environmental-engineering-research-institute-neeri
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/council-scientific-and-industrial-research-csir
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/haryana
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/uttar-pradesh