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• ▶ B.C. camp teaches kids with asthma how to handle poor air quality CBC News · 2026.08.06

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• 한국의 실내에서의 라돈농도 세계 2위 Radon Levels in South Korean Homes are 2nd Highest in the WorldPosted November 20, 2013 by Pristine Home 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