Greater nitrogen dioxide concentrations at child versus adult breathing heights close to urban main road kerbside (7 page pf, Hannah S. Kenagy, Chun Lin, Hao Wu & Mathew R. Heal, Air Qual Atmos Health, Sep. 3, 2015)
Roadside emissions have been shown to pose a health threat for people living or travelling close to the roads but the studies have been restricted to measuring the exposure several metres above ground rather than at the same level as the exhaust itself or for people breathing in the pollution at different heights. Today we review research into this question with a focus on how this may pose a greater threat for children either walking or in a stroller/buggie at lower heights than their accompanying adults. Results indicate that NO2 concentration levels are 5 to 15% higher closer to the ground within 1.2 m of the side of the road or curb- with other actors such as windspeed kept constant. This has health implications for children near roads with heavy traffic (above 12,000 vehicles per day which is typical for a 2 lane busy urban road) and might suggest a greater setback for sidewalks for example.
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