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Why You Don't Want to Cycle to Work as Your Exercise

Bicycling to work may sound healthy, but a new study reveals that people cycling in cities inhale five times as many toxic nanoparticles as drivers or pedestrians.

Researchers fitted cyclists with devices that could count the particles, which are mostly emitted by car exhausts.  Because cyclists are exerting themselves, they breathe harder and faster, with the result that they can inhale tens of millions of particles with each breath.

The Times reports:

“A study ... to be published soon in the journal Epidemiology, is expected to show that exposures to high concentrations of nanoparticles are associated with a higher risk of heart disease ... Other studies have shown that exposure to particulate pollution can have rapid short-term effects too -- such as provoking asthma attacks.”

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