In-situ Air Quality Measurements On Existing
And Innovative Noise Barriers
Author(s)
J. Hooghwerff, C. C. Tollenaar & W. J. van der Heijden
Abstract
From literature and wind tunnel studies it had already been concluded that noise
barriers might make a significant contribution to improving air quality. Within
the Dutch Air Quality Innovation Programme (IPL) several trials have been
conducted at a test site along a highway to assess the impact of noise barriers on
air quality along arterial roads. In 2007 IPL did organise a competition
challenging companies to come up with innovative barrier designs having an
additional impact on air quality compared with conventional barriers. M+P –
consulting engineers was commissioned to measure the impact of standard and
optimised barriers on concentrations of NO2, NOx, PM10 and PM2.5 behind the
barrier. In five monitoring sessions each lasting around three months, the
performance of nine different barriers was investigated. The measurements were
done at thirteen different positions. From the results it became clear that noise
barriers reduce concentrations of nitrogen oxides and airborne particulates along
motorways significantly. For example, effects of 20% for NOx were found at
10 m behind the reference barrier. The measurements show that the barrier
height is a relevant parameter for the effect of the barrier. A 7m-barrier shows
considerably higher reductions compared to the 4m-barrier. From the results it is
also clear that the measured effects of the innovative barriers were consistently
lower than for the \“reference barrier”. It should be kept in mind that because of
the major uncertainties involved, in many cases the effects statistically do not
differ significantly. It is unknown why the reference barrier performs somewhat
better than the other 4-meter-high innovative barriers.
Keywords: barriers, mitigation, nitrogen oxides, airborne particulates,
innovation, measurements.
Keywords
barriers, mitigation, nitrogen oxides, airborne particulates,
innovation, measurements
Related Book
Other papers in this volume
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