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A meta-analysis of selected near-road air pollutants based on concentration decay rates
Citation:
Liu, S., F. Chen, AND J. Xue. A meta-analysis of selected near-road air pollutants based on concentration decay rates. Heliyon. Elsevier B.V., Amsterdam, Netherlands, 5(8):e02236, (2019). https://doi.org/10.1016/j.heliyon.2019.e02236
Impact/Purpose:
Traffic-related air pollution has been associated with various health risks for human populations living near roadways. Understanding the relationship between traffic density and dispersion of vehicle-released air pollutants is important for assessing human exposure to near-road air pollutants.
Description:
Traffic-related air pollution has been associated with various health risks for human populations living near roadways. Understanding the relationship between traffic density and dispersion of vehicle-released air pollutants is important for assessing human exposure to near-road air pollutants. We performed a literature survey targeting publications containing measurement data of traffic-related air pollutants near roads with distance information on their concentration distribution. Concentration decay rates over down-wind distance away from major roads were calculated for black carbon (BC), carbon monoxide (CO) and nitrogen oxides (NO2 or NOx) and meta-data analysis on these rates was performed. These analyses showed metadata-based exponential decay rates of 0.0026, 0.0019, 0.0004, and 0.0027 m−1 for BC, CO, NO2 and NOx, respectively. Using these measurement data-based decay rates, concentrations for BC, CO, NO2 and NOx over various near-road distances were predicted. These results are useful for enhancing exposure modeling and thus more reliably assessing the health risk of exposure to near road air pollution.
URLs/Downloads:
DOI: A meta-analysis of selected near-road air pollutants based on concentration decay rates
https://www.ncbi.nlm.nih.gov/pubmed/31485506