Right around the time when the days start getting longer and temps begin to rise, it's normal to want to ditch your spin class and liberate the road bike that's been sitting idle in your garage. What's not to love about filling your lungs with fresh spring air?
Actually, there is something. If your favorite bike path winds along a busy thoroughfare, or the tennis court you frequent is located near a traffic-clogged intersection, you may be loading your lungs with harmful pollutants in the form of ozone (the main component of smog) and microscopic bits of soot, dust, aerosol, metal, free radicals, and other airborne contaminants. Not only does this toxic assault on your lungs compromise the effectiveness of your workouts, but it can also take a toll on your health.
Running on Fumes
Source: http://www.womenshealthmag.com/health/air-health
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