Since 2012-13, sales have more than doubled, encouraging manufactures to ramp up operations in the county
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/air-purifier-sales-surge-rising-pollution-worries
[2] http://admin.indiaenvironmentportal.org.in/category/author/arnab-dutta
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/beijing
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/electronics-industry