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• 한국의 실내에서의 라돈농도 세계 2위 -2nd-highest-in-the-world/ Radon Levels in South Korean Homes are 2nd Highest in the WorldPosted November each year in the U.S., radon gas is a carcinogen that is officially the second most common cause of lung blog.naver.com · 2018.06.08