Short-Term Variation in Near-Highway Air Pollutant Gradients on a Winter Morning
Atmos. Chem. Phys., 10, 8341–8352, 2010 www.atmos-chem-phys.net/10/8341/2010/ Atmospheric doi:10.5194/acp-10-8341-2010 Chemistry © Author(s) 2010. CC Attribution 3.0 License. and Physics Short-term variation in near-highway air pollutant gradients on a winter morning J. L. Durant1, C. A. Ash1, E. C. Wood2, S. C. Herndon2, J. T. Jayne2, W. B. Knighton3, M. R. Canagaratna2, J. B. Trull1, D. Brugge4, W. Zamore5, and C. E. Kolb2 1Department of Civil & Environmental Engineering, Tufts University, Medford, MA, USA 2Aerodyne Research Inc., Billerica, MA, USA 3Montana State University, Bozeman, MT, USA 4School of Medicine, Tufts University, Boston, MA, USA 5Mystic View Task Force, Somerville, MA, USA Received: 8 January 2010 – Published in Atmos. Chem. Phys. Discuss.: 25 February 2010 Revised: 19 August 2010 – Accepted: 20 August 2010 – Published: 6 September 2010 Abstract. Quantification of exposure to traffic-related air the highway reflecting reaction with NO. There was little if pollutants near highways is hampered by incomplete knowl- any evolution in the size distribution of 6–225 nm particles edge of the scales of temporal variation of pollutant gradi- with distance from the highway. These results suggest that to ents. The goal of this study was to characterize short-term improve the accuracy of exposure estimates to near-highway temporal variation of vehicular pollutant gradients within pollutants, short-term (e.g., hourly) temporal variations in 200–400 m of a major highway (>150 000 vehicles/d). Mon- pollutant gradients must be measured to reflect changes in itoring was done near Interstate 93 in Somerville (Mas- traffic patterns and local meteorology.
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