As much as 80 percent of the PM2.5 inhaled by Beijing residents are in their home and office rather than the open air, a recent survey has revealed.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/80-percent-pm25-inhaled-indoors-beijing
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/china-daily
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indoor-air-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects