@article {deng2018characteristics,
	title = {Characteristics of volatile organic compounds, NO2, and effects on ozone formation at a site with high ozone level in Chengdu},
	journal = {Journal of Environmental Sciences},
	year = {2018},
	publisher = {Elsevier},
	abstract = {Chengdu is a\&nbsp;megacity\&nbsp;in the southwest of China with high\&nbsp;ozone\&nbsp;(O3)\&nbsp;mixing ratio. Observation of volatile organic compounds (VOCs), NO2\&nbsp;and O3\&nbsp;with high\&nbsp;temporal resolution\&nbsp;was conducted in Chengdu to investigate the\&nbsp;chemical processes\&nbsp;and causes of high O3\&nbsp;levels. The hourly mixing ratios of VOCs, NO2, and O3\&nbsp;were monitored by an online system from 28 August to 7 October, 2016. According to meteorological conditions, Chengdu, with relative warm weather and low wind speed, is favorable to O3\&nbsp;formation. Part of the O3\&nbsp;in Chengdu may be transported from the downtown area. In O3\&nbsp;episodes, the average mixing ratios of NO2\&nbsp;and O3\&nbsp;were 20.20 ppbv and 47.95 ppbv, respectively. In non-O3\&nbsp;episodes, the average mixing ratios of NO2\&nbsp;and O3\&nbsp;were 16.38 ppbv and 35.15 ppbv, respectively. The average mixing ratio of total VOCs (TVOCs) was 40.29 ppbv in non-O3episodes, which was lower than that in O3\&nbsp;episodes (53.19 ppbv).\&nbsp;Alkenes\&nbsp;comprised 51.7\% of the total O3\&nbsp;formation potential (OFP) in Chengdu, followed by aromatics which accounted for 24.2\%.\&nbsp;Ethylene, trans-pentene, propene, and BTEX (benzene, ethylbenzene,\&nbsp;toluene, m/p-xylene, o-xylene) were also major contributors to the OFP in Chengdu. In O3\&nbsp;episodes, intensive secondary formations were observed during the campaign. Oxygenated VOCs (OVOCs), such as\&nbsp;acetone, Methylethylketone (MEK), and Methylvinylketone (MVK) were abundant.\&nbsp;Isoprene\&nbsp;rapidly converted to MVK and Methacrolein (MACR) during O3\&nbsp;episodes. Acetone was mainly the\&nbsp;oxidant\&nbsp;of C3-C5\&nbsp;hydrocarbons.},
	url = {https://www.sciencedirect.com/science/article/pii/S1001074217335532},
	author = {Deng, Yuanyuan and Jing Li and Li, Yaqi and Wu, Rongrong and Shaodong Xie}
}
