Outdoor pools boost child's asthma risk: study

Why Michael Phelps cannot swim well.

"Swimming in outdoor chlorinated pools appears to increase the odds a child will develop asthma, Belgian researchers said on Thursday.

Other studies have linked chlorine and asthma but the new findings published in the European Respiratory Journal cast doubt on the idea outdoor pools are safer than indoor ones where chlorine vapors remains trapped inside an enclosed space.

'The more you swim, the higher the risk,' said Alfred Bernard, a toxicologist at Catholic University of Louvain in Brussels, who led the study. 'What is new in this study is that we looked at outdoor pools for the first time.'"

Shortness of breath.

Another mystery unraveled by brilliant research.