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  • Study: High ozone days increase risk of heart attack add to reading list  

    Posted on February 19, 2013 at 8:02 PM

    Updated Tuesday, Feb 19 at 8:20 PM

    You might think that Houston’s high ozone level days just make it hard to breathe, but a new study suggests that you also have a higher risk of a heart attack.

    By KHOU.com staff
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