Johns Hopkins Bloomberg School of Public Health researchers say that levels of radon in Pennsylvania homes - where 42 percent of readings surpass what the U.S.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/fracking-appears-be-linked-rise-radon-levels-pennsylvania-homes
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/environment-news-network
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/natural-gas
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/natural-gas-exploration
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us