Juan Xu 1, Min Zhang 2 , Mark Zhou 3, Anna Kelley 4 , Heng Wei 5 and Mingming Lu 1* 1 Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH 45221, USA 2 School of Mechanical & Electric Technology, Suzhou Institute of Trade & Commerce, Suzhou, China, 215009. 3 The Summit Country Day School, 2161 Grandin Road, Cincinnati, OH 45208 4 Southwest Ohio Air Quality Agency, 250 William Howard Taft Road, Cincinnati, OH45219, USA 5 Department of Civil and Architectural Engineering, University of Cincinnati, Cincinnati, Ohio 45221, USA * Corresponding Author ABSTRACT Traffic-related air pollutants (black carbon, PM2.5, NOx and NO2) emissions have been an issue of public health concern to Federal, State, and local government agencies, especially in recent years. Black carbon (BC), portion of the particulate matter including PM2.5, is formed due to incomplete combustion, and can result in adverse health impacts as well as global warming. To study traffic emissions, three typical traffic sites, a major intersection, an interstate site and a near road site, were monitored. Data on meteorology, vehicle type and traffic volume were also collected in Cincinnati, OH, a typical city in Midwest US. Due to its long history of air pollutant monitoring, Cincinnati is among 49 Phase I sites in the US to have near road traffic emission monitoring (since 2014). This paper compares air pollutant emissions from these traffic sites with an N-core site that is subject to non-traffic sources. Both traffic and meteorological parameters are also analyzed in their contribution to emissions. Traffic emissions receive increasing health concerns as many houses and shops are located near traffic sources. More pedestrians can also be subject to air pollutants from traffic emissions.

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