Influential factors affecting black carbon trends at four sites of differing distance from a major highway in Las Vegas.

ABSTRACT: Elevated air pollution levels adjacent to major highways are an ongoing topic of public health concern worldwide. Black carbon (BC), a component of particulate matter (PM) emitted by diesel and gasoline vehicles, was measured continuously via a filter-based light absorption technique over ~ 16 months at four different stations positioned on a perpendicular trajectory to a major highway in Las Vegas, NV. During downwind conditions (winds from the west), BC at 20 m from the highway was 32 and 60% higher than concentrations at 100 and 300 m from the roadway, respectively. Overall highest roadside (20-m site) BC concentrations were observed during the time period of 4 a.m.-8 a.m. under low-speed variable winds (3.02 μg/m3) or downwind conditions (2.84 μg/m3). The 20-m site BC concentrations un

SUBMITTER: Kimbrough S 

PROVIDER: S-EPMC7359888 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature