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Do soundwalls block dust, dirt, and soot (particulate matter) produced by freeway traffic?

April 26, 2017block Dirt dust Freeway Particulate produced SOOT soundwalls Traffic

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Do soundwalls block dust, dirt, and soot (particulate matter) produced by freeway traffic?

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Barriers provide some limited protection from highway particulate matter as evidenced by concentrations often found at the base of the highway side of a soundwall. Soundwalls likely have minimal effect in stopping airborne soot and other aerosol particulate matter and vehicular emissions.