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Hopkins study says radon levels rose after fracking in Pa.

The increasing use of hydraulic fracturing to extract natural gas in Pennsylvania over the past decade has been accompanied by an increase in levels of radon gas, according to a new study, but the study's leader says it's not clear that the drilling method, known as fracking, has caused the increased levels of the naturally-occurring radioactive gas, which has been shown to increase the risk of lung cancer. Researchers from the Johns Hopkins University Bloomberg School of Public Health examined nearly 2 million radon measurements taken across Pennsylvania between 1987 and 2013, and compared the figures from before and after fracking began in 2005.

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