VOC Characteristics and Their Source Apportionment in the Yangtze River Delta Region during the G20 Summit

Abstract

To evaluate the effectiveness of measures to reduce the levels of volatile organic compounds (VOCs), which are important precursors of ground-level ozone formation, the real-time monitoring data of VOCs at the urban Zhaohui supersite (ZH), the Dianshan Lake regional supersite (DSL) and the urban Yixing station (YX) in the Yangtze River Delta region were analyzed from 23 August to 15 September 2016 during the G20 Hangzhou Summit. The average mole ratios of VOCs at the three sites were 6.56, 21.33 and 19.62 ppb, respectively, which were lower than those (13.65, 27.72 and 21.38 ppb) after deregulation. The characteristics of the VOCs varied during the different control periods. Synoptic conditions and airmass transport played an important role in the transport and accumulation of VOCs and other pollutants, which affected the control effects. Using the positive matrix factorization (PMF) method in source apportionment, five factors were identified, namely, vehicle exhaust (19.66–31.47%), plants (5.59–17.07%), industrial emissions (13.14–33.82%), fuel vaporization (12.83–26.34%) and solvent usage (17.84–28.95%) for the ZH and YX sites. Factor 4 was identified as fuel vaporization + incomplete combustion (21.69–25.35%) at the DSL site. The Non-parametric Wind Regression (NWR) method showed that regional transport was the main factor influencing the VOC distribution.

Evaluation of VOCs Emitted from Biomass Combustion in a Small CHP Plant: Difference between Dry and Wet Poplar Woodchips

“…This phenomenon is due to a higher moisture content that leads to a lower-quality combustion process. In fact, a higher quantity of VOCs is originated from an incomplete combustion phenomenon [ 33 ]. Once the VOC concentrations relative to two different moisture levels of the biomass were obtained, the authors thought of constructing the lines that can express an ideal linear trend in the increase in the concentrations of the VOC classes as a function of the increasing moisture content ( Figure 5 ).…”

Research progresses on VOCs emission investigationsviasurface and satellite observations in China

“…a 22, 81 and 82.b 17, 28, 68, 72, 76 and 83–89.c 7.d 2, 4, 14, 16, 18, 19, 21, 29–31, 35, 48, 49, 58, 70, 73, 75 and 90–109.e 71 and 109–111.f 1, 14, 15, 22, 30, 31, 35, 37, 65, 93, 95, 107, 112–115 and 115–118.g 35.h 17, 37, 74, 116 and 119–121.i 122 and 123.j 13, 20, 23, 32–34, 51, 57, 94, 123–127, 127–129 and 129–134.k 123.l 26 and 135–137.m 23, 25, 26, 119…”

Characteristics and Sources of Volatile Organic Compounds in the Nanjing Industrial Area

“…Therefore, to clarify the characteristics and sources of local VOC changes, reasonable VOC emission reduction measures need to be formulated as a reduction in VOCs could also have a positive effect on the control of O 3 and PM 2.5 due to the highly reactive VOCs with high O 3 formation potential (OFP) and secondary organic aerosols potential (SOAP). Previous studies in Nanjing have mostly focused on the detection and source analysis of VOCs within a single season with less of a focus on the detection of VOCs throughout a whole year, which cannot reflect the changing characteristics of VOCs and their sources in different seasons [20][21][22]. Therefore, it has not been possible to develop reasonable measures for the different seasons because unreasonable emission reduction measures can lead to both a decline in industrial production and the potential aggravation of air pollution.…”