TR News September–October 2013: Environmental Sustainability in Transportation (2013) / Chapter Skim
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Pages 14-18

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From page 14...
... TR N EW S 28 8 SE PT EM BE R– O CT O BE R 20 13 14 An international consensus has emerged thatpeople living, working, and going to schoolnear roads with high volumes of traffic face increased risks for adverse health effects (1) , most likely from acute and chronic exposures to elevated levels of air pollution, including particulate matter (PM)
From page 15...
... TR N EW S 288 SEPTEM BER–O CTO BER 2013 15 the monitoring rules for the National Ambient Air Quality Standards (NAAQS) require monitors for PM, carbon monoxide (CO)
From page 16...
... TR N EW S 28 8 SE PT EM BE R– O CT O BE R 20 13 16 The measurements suggest that the barrier led to an increase in air mixing, resulting in lower behindbarrier concentrations at ground level. Field and wind tunnel studies also suggest an enhanced capture of PM by the vegetation; generally, the concentrations of ultrafine and coarse-mode PM decrease, with limited reductions in fine-particle PM2.5 mass.
From page 17...
... TR N EW S 288 SEPTEM BER–O CTO BER 2013 17 winds continuously flush out the pollutants (13)
From page 18...
... TR N EW S 28 8 SE PT EM BE R– O CT O BE R 20 13 18 Mulch helps to conserve soil moisture around the tree. Too much mulch, however, can become a seedbed for weeds and fungus.

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