>>  CNY Climate and Air Quality

Simply,

     any regular activity is likely good for your health, that is, where you're not engulfed in motor vehicle exhaust.

A NYC Department of Health city-wide survey of NYC reported in Dec. 2009, 

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• "The positive relationship between better health and regular integrated physical activity holds at all levels of income.
• Regular walking and biking is also related to self-reported better health regardless of weight. Obese New Yorkers who integrate physical activity are more likely to report excellent, very good or good health than those who do not (75% vs. 64%). "
  

(More... http://www.nyc.gov/html/doh/html/pr2009/pr077-09.shtml

             http://www.streetsblog.org/2009/12/03/confirmed-new-yorkers-reap-health-benefits-from-walking-and-biking  )

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