Barriers by Roadways: The Efficacy of Long Beach’s Great Wall of Mulch in Reducing Pollutant Concentrations in Adjacent Areas Barriers by Roadways: The Efficacy of Long Beach's Great Wall of Mulch in Reducing Pollutant Concentrations in Adjacent Areas Project ID: LA1715 Year Completed: 2018 Suzanne Paulson (PI) Professor paulson@atmos.ucla.edu Program Area(s): Environment By UCLA ITS Staff|2025-03-30T23:06:33-07:00March 30th, 2025| Share This Story, Choose Your Platform! FacebookXLinkedInEmail