<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Coggon, Matthew M.</style></author><author><style face="normal" font="default" size="100%">McDonald, Brian C.</style></author><author><style face="normal" font="default" size="100%">Vlasenko, Alexander</style></author><author><style face="normal" font="default" size="100%">Veres, Patrick R.</style></author><author><style face="normal" font="default" size="100%">Bernard, Francois</style></author><author><style face="normal" font="default" size="100%">Koss, Abigail R.</style></author><author><style face="normal" font="default" size="100%">Yuan, Bin</style></author><author><style face="normal" font="default" size="100%">Gilman, Jessica B.</style></author><author><style face="normal" font="default" size="100%">Peischl, Jeff</style></author><author><style face="normal" font="default" size="100%">Aikin, Kenneth C.</style></author><author><style face="normal" font="default" size="100%">DuRant, Justin</style></author><author><style face="normal" font="default" size="100%">Warneke, Carsten</style></author><author><style face="normal" font="default" size="100%">Li, Shao-Meng</style></author><author><style face="normal" font="default" size="100%">de Gouw, Joost A.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Diurnal Variability and Emission Pattern of Decamethylcyclopentasiloxane (D-5) from the Application of Personal Care Products in Two North American Cities</style></title><secondary-title><style face="normal" font="default" size="100%">ENVIRONMENTAL SCIENCE &amp;amp; TECHNOLOGY</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2018</style></year><pub-dates><date><style  face="normal" font="default" size="100%">MAY 15</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">10</style></number><volume><style face="normal" font="default" size="100%">52</style></volume><pages><style face="normal" font="default" size="100%">5610-5618</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Decamethylcyclopentasiloxane (D-5) is a cyclic volatile methyl siloxane (cVMS) that is widely used in consumer products and commonly observed in urban air. This study quantifies the ambient mixing ratios of D-5 from ground sites in two North American cities (Boulder, CO, USA, and Toronto, ON, CA). From these data, we estimate the diurnal emission profile of D-5 in Boulder, CO. Ambient mixing ratios were consistent with those measured at other urban locations; however, the diurnal pattern exhibited similarities with those of traffic-related compounds such as benzene. Mobile measurements and vehicle experiments demonstrate that emissions of D-5 from personal care products are coincident in time and place with emissions of benzene from motor vehicles. During peak commuter times, the Ds/benzene ratio (w/w) is in excess of 0.3, suggesting that the mass emission rate of D-5 from personal care product usage is comparable to that of benzene due to traffic. The diurnal emission pattern of D-5 is estimated using the measured Ds/benzene ratio and inventory estimates of benzene emission rates in Boulder. The hourly D-5 emission rate is observed to peak between 6:00 and 7:00 AM and subsequently follow an exponential decay with a time constant of 9.2 h. This profile could be used by models to constrain temporal emission patterns of personal care products.</style></abstract></record></records></xml>