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Impacts of Noise Barriers on Near-Road Air Quality
Citation:
BALDAUF, R., E. Thoma, A. Khlystov, V. ISAKOV, G. BOWKER, T. Long, AND R. Snow. Impacts of Noise Barriers on Near-Road Air Quality. ATMOSPHERIC ENVIRONMENT. Elsevier Science Ltd, New York, NY, 42(32):7502-7507, (2008).
Impact/Purpose:
To inform public
Description:
Numerous health studies show an increase in adverse health effects for populations near large roadways. A study was designed to assess traffic emission impacts on air quality near a heavily traveled highway. The portion of highway studied included a section of open field and a section with a noise barrier adjacent to the road. The section containing the noise barrier included a portion with vegetation in the vicinity of the barrier. Thus, this study provided an opportunity to evaluate near-road air quality with no barriers, with a noise barrier only, and with a noise barrier and vegetation adjacent to the road. Pollutants measured under these scenarios included carbon monoxide (CO) and particulate matter (PM). Measurements showed the noise barrier often led to pollutant concentration reductions behind the barrier during meteorological conditions with winds directionally from the road. CO and PM number concentrations generally decreased between 15 and 50 percent behind the barrier. However, conditions occurred when pollutant concentrations were greater behind the barrier than when no barrier was present. Thus a noise barrier can lead to higher pollutant concentrations on the road during certain wind conditions. In addition, the study results suggested that the presence of mature trees in addition to the barrier further lowered PM concentrations.
