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 Just Accepted

This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.


The Impact of Anthropogenic Volatile Organic Compounds Sources on Ozone in Boise, Idaho

Victor Vargas, Marie-Cecile Chalbot, Robert O'Brien, George Nikolich, Dave DuBois, Vicken Etyemezian, Ilias Kavouras

Abstract

Here, we present the application of a tiered approach to apportion the contributions of volatile organic compounds (VOCs) sources on ozone (O3) concentrations. VOCs from acetylene to n-propylbenzene were measured at two sites at Boise, Idaho, using an online pneumatically-focused gas chromatography system. The mean 24-hr concentrations of individual VOC varied from 0.4 ppbC (parts per billion carbon) for 1-butene to 23.2 ppbC for m/p-xylene. The VOCs sources at the two monitoring sites were determined by positive matrix factorization. They were attributed to: (i) liquefied petroleum and natural gas (LPG/NG) emissions; (ii) fugitive emissions of olefins from fuel and solvents; (iii) fugitive emissions of aromatic VOCs from area sources and; (iv) vehicular emissions. Vehicle exhausts accounted for from 36% to 45% of VOCs followed by LPG/NG and fugitive emissions of aromatic VOCs. Evaluation of photochemical changes showed that the four separate VOCs sources rather than different stages of photochemical processing of fresh emissions. The contributions of VOC sources on daily 8-hr maximum O3 concentrations measured at seven locations in the metropolitan urban area were identified by regression analysis. The four VOCs sources added, on average, from 6.4 ppbv to 16.5 ppbv O3, while the unexplained (i.e. intercept) O3 was comparable to non-wildfire policy-relevant background background O3 levels in the absence of all anthropogenic emissions of VOC precursors in North America for the region. Traffic was the most significant source influencing O3 levels contributing up to 32 ppbv for days with O3 concentrations higher than 75 ppbv.

EN13150  Accepted 10 April 2014
 
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