Guan Yanan, Liu Xuejiao, Zheng Zhiyang, Dai Yanwei, Du Guimin, Han Jing, Hou Li'an, Duan Erhong
School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China; National Joint Local Engineering Research Center for Volatile Organic Compounds and Odorous Pollution Control, Shijiazhuang, 050018, China.
School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China.
Environ Pollut. 2023 Apr 15;323:121293. doi: 10.1016/j.envpol.2023.121293. Epub 2023 Feb 15.
One of the major pollutants influencing urban air quality in China is O. O is the second most important pollutant affecting air quality in Shijiazhuang, which is the third largest city in the Beijing-Tianjin-Hebei area and the provincial capital of Hebei province. To fully understand the characteristics of O and volatile organic compounds (VOCs), which are O precursors, and the role of VOCs to ozone formation, we measured the hourly concentrations of O and 85 VOCs in Shijiazhuang continuously from January to November 2020, and the concentration characteristics of both together with the chemical reactivity and sources of VOCs were analyzed from a seasonal perspective. The O concentration in Shijiazhuang showed a phenomenon of high summer and low winter, and the VOCs showed a phenomenon of high winter and low spring. In the summer when the O exceedance rate is the highest, the time-domain variation characteristics of O were analyzed by wavelet analysis model, and the main periods controlling the O concentration variation in Shijiazhuang in summer 2020 were 52 days, 32 days, 19 days and 12 days. The maximum incremental reactivity (MIR) and propylene equivalence method indicated ethene, propylene and 1-pentene were common substances in the top five species of each season. The T/B, Iso-p/N-p, Iso-p/E, N-p/E, and positive matrix factorization (PMF) model showed that industrial source (18.62%-22.03%) and vehicle emission (13.20%-17.69%) were the major VOCs sources in Shijiazhuang. Therefore, to control the O concentration in Shijiazhuang, it is necessary to decrease alkenes emissions as well as VOCs from industrial source and vehicle emission.
影响中国城市空气质量的主要污染物之一是臭氧。臭氧是影响京津冀地区第三大城市、河北省省会石家庄市空气质量的第二重要污染物。为全面了解臭氧及其前体挥发性有机化合物（VOCs）的特征，以及VOCs对臭氧形成的作用，我们于2020年1月至11月在石家庄市连续测量了臭氧和85种VOCs的小时浓度，并从季节角度分析了二者的浓度特征以及VOCs的化学反应活性和来源。石家庄市的臭氧浓度呈现出夏季高、冬季低的现象，而VOCs则呈现出冬季高、春季低的现象。在臭氧超标率最高的夏季，通过小波分析模型对臭氧的时域变化特征进行了分析，2020年夏季控制石家庄市臭氧浓度变化的主要周期为52天、32天、19天和12天。最大增量反应活性（MIR）和丙烯等效法表明，乙烯、丙烯和1-戊烯是每个季节前五大物种中的常见物质。T/B、异戊烷/正戊烷、异戊烷/乙烯、正戊烷/乙烯以及正定矩阵因子分解（PMF）模型表明，工业源（18.62%-22.03%）和机动车排放源（13.20%-17.69%）是石家庄市VOCs的主要来源。因此，要控制石家庄市的臭氧浓度，有必要减少烯烃排放以及工业源和机动车排放源的VOCs排放。
