<?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%">Haichao Wang</style></author><author><style face="normal" font="default" size="100%">Lu, Keding</style></author><author><style face="normal" font="default" size="100%">Xiaorui Chen</style></author><author><style face="normal" font="default" size="100%">Qindan Zhu</style></author><author><style face="normal" font="default" size="100%">Chen, Qi</style></author><author><style face="normal" font="default" size="100%">Song Guo</style></author><author><style face="normal" font="default" size="100%">Meiqing Jiang</style></author><author><style face="normal" font="default" size="100%">Xin Li</style></author><author><style face="normal" font="default" size="100%">Dongjie Shang</style></author><author><style face="normal" font="default" size="100%">Zhaofeng Tan</style></author><author><style face="normal" font="default" size="100%">Yusheng Wu</style></author><author><style face="normal" font="default" size="100%">Zhijun Wu</style></author><author><style face="normal" font="default" size="100%">Qi Zou</style></author><author><style face="normal" font="default" size="100%">Yan Zheng</style></author><author><style face="normal" font="default" size="100%">Limin Zeng</style></author><author><style face="normal" font="default" size="100%">Zhu, Tong</style></author><author><style face="normal" font="default" size="100%">Min Hu</style></author><author><style face="normal" font="default" size="100%">Yuanhang Zhang</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">High N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; Concentrations Observed in Urban Beijing: Implications of a Large Nitrate Formation Pathway</style></title><secondary-title><style face="normal" font="default" size="100%">Environmental Science &amp;amp; Technology Letters</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2017</style></year></dates><volume><style face="normal" font="default" size="100%">4</style></volume><pages><style face="normal" font="default" size="100%">416-420</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The heterogeneous hydrolysis of dinitrogen pentoxide (N2O5) is important to understanding the formation of particulate nitrate (pNO(3)(-)). Measurements of N2O5 in the surface layer taken at an urban site in Beijing are presented here. N2O5 was observed with large day-to-day variability. High N2O5 concentrations were determined during pollution episodes with the co-presence of large aerosol loads. The maximum value was 1.3 ppbv (5 s average), associated with an air mass characterized by a high level of O-3. N2O5 uptake coefficients were estimated to be in the range of 0.025-0.072 using the steady-state lifetime method. As a consequence, the nocturnal pNO(3)(-) formation potential by N2O5 heterogeneous uptake was calculated to be 24-85 mu g m(-3) per night and, on average, 57 mu g m(-3) during days with pollution. This was comparable to or even higher than that formed by the partitioning of HNO3. The results highlight that N2O5 heterogeneous hydrolysis is vital in pNO(3)(-) formation in Beijing.</style></abstract><issue><style face="normal" font="default" size="100%">10</style></issue></record></records></xml>