Characterization of individual particles and meteorological conditions during the cold season in Zhengzhou using a single particle aerosol mass spectrometer

Wang, Shenbo; He, Bing; Yuan, Minghao; Su, Fangcheng; Yin, Shasha; Yan, Qishe; Jiang, Nan; Zhang, Ruiqin; Tang, Xiaoyan

doi:10.1016/j.atmosres.2018.12.021

Cited by 19 publications

(11 citation statements)

References 102 publications

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“…C. reported that the southern cities of Henan Province (e.g., Nanyang, Shangqiu, Zhoukou, and Zhumadian) had relatively higher ammonia emissions than the cities involved in this study. Moreover, the northeastern air masses from the Jing-Jin-Ji regions were easily enriched with sulfate (S. Wang et al, 2019a. Evidently, back-trajectory frequency analysis (see Text S2 in the Supplement for more details of the discussion) confirmed that sampling sites during Cases 1 and 3 ( Fig.…”

Section: Haze Episodesmentioning

confidence: 70%

Effect of ammonia on fine-particle pH in agricultural regions of China: comparison between urban and rural sites

Wang

Wang²,

et al. 2020

Atmos. Chem. Phys.

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Abstract. Particle acidity is a fundamental property that affects atmospheric particulate chemistry. Synchronous online monitoring was performed at two urban sites, Zhengzhou (U-ZZ) and Anyang (U-AY), and three rural sites, Anyang (R-AY), Xinxiang (R-XX), and Puyang (R-PY) in Henan Province, during a haze episode to investigate the pH value and its driving factors in the agricultural regions of China. The pH values of particles calculated by ISORROPIA-II model at rural sites were slightly higher than those at urban sites, with the median (min–max) values of 5.2 (4.8–6.9, R-PY), 5.1 (4.7–6.5, R-AY), 4.9 (4.1–6.8, R-XX), 4.8 (3.9–5.9, U-AY), and 4.5 (3.8–5.2, U-ZZ). Sensitivity tests show that TNHx (total ammonium, gas + aerosol) followed by total sulfate were the most important factors that influenced the predicted pH. Generally, particle pH increased with a cation increase and decreases in anions, temperature, and relative humidity. Similar pH values (∼3.0) at the required NHx concentrations for the five sites indicated that the presence of excess NHx was likely important for the lower acidity of PM2.5 during the severe haze episodes in this region. Moreover, the concentrations of excess NHx may drive the higher pH values at rural sites, because of the higher excess NHx concentrations at rural sites than those at urban sites. The underlying influence of regional transport on local particle pH cannot be neglected, as it differs the chemical components of PM2.5 and meteorological conditions. Air masses transported from rural and agricultural regions may enhance the particle pH value in urban aerosols given the high pH of particles and high ammonia levels. These results suggest that ammonia is urgently needed to be involved in the regional strategy for the improvement of air quality in China.

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Section: Haze Episodesmentioning

confidence: 70%

Effect of ammonia on fine-particle pH in agricultural regions of China: comparison between urban and rural sites

Wang

Wang²,

et al. 2020

Atmos. Chem. Phys.

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“…In this paper, the air clusters were analyzed by using the Hybrid Single Particle Lagrangian Integrated Trajectory model to distinguish the differences of potential source contributions in the three periods. In previous studies, regional transport has an important influence on Zhengzhou's air quality, especially the air mass from the BTH region (Jiang et al, 2019;Wang et al, 2019b). Fig.…”

Section: Meteorological Conditionsmentioning

confidence: 93%

Characterization of ambient volatile organic compounds, source apportionment, and the ozone-NOx-VOC sensitivities in a heavily polluted megacity of central China: Effect of sporting events and the emission reductions

Shang

Yin

et al. 2021

Preprint

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Abstract. Abstract: The implementation of strict emission control during the 11th National Minority Games (NMG) in September 2019 provided a valuable opportunity to assess the impact of such emission controls on the characteristics of VOCs and other air pollutants. Here, we investigated the characteristics of VOCs and the O3-NOx-VOCs sensitivity comprehensively in Zhengzhou before, during, and after the NMG by delivering field measurements combined with the WRF (Weather Research and Forecasting)-CMAQ (Community Multi-scale Air Quality) model simulations. The average mixing ratios of VOCs during the control periods were 34 ppbv, and cut down by about 16% before and after emission reduction. The ozone precursors (NOx) also decreased significantly during the control period; however, the ozone pollution was severe during the entire observation period. Positive Matrix Factorization analysis indicated seven major sources of ambient VOCs, including coal combustion, biomass burning, vehicle exhausts, industrial processes, biogenic emissions, solvent utilization and liquefied petroleum gas (LPG). The results show that the major source emissions, such as coal combustion and solvent utilization, were significantly reduced during the control period. As for ozone formation potential (OFP), the value during the control period was 183 μg/m3, which was 0.23 and 0.17 times lower than those before and after control period, respectively. Solvent utilization and combustion controls were the most important measures taken to reduce OFP during NMG period. Through control policies, it can effectively reduce carcinogenic risk. However, non-cancer risks of ambient VOC exposures were all exceeding the safe level (hazard quotient = 1) during the sampling periods, and emphasis on the reduction of acrolein emissions was needed. In addition, the WRF/CMAQ model simulation indicated that O3 formation was controlled by VOCs in Zhengzhou. The results of the Empirical Kinetic Modelling Approach showed that the NOx reduction in Zhengzhou might led to higher ozone pollution. It is suggested that reduction ratios of the precursors (VOCs : NOx) is more than 2, which can effectively alleviate ozone pollution.

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“…The hourly mass concentrations of water-soluble inorganic ions (WSIIs) in PM2.5, such as NH4 + , SO4 2− , NO3 − , Cl − , Na + , Mg 2+ , Ca 2+ , and K + and their gaseous precursors (i.e., NH3,HNO3 and HCl) were measured using an ambient ion monitor (URG-9000D, Thermal Fisher Scientific, USA) in U-ZZ site and the monitor for aerosols and gases (MARGA, Metrohm, Switzerland) in four other sites. Both instruments are successfully deployed in several other field experiments using the similar analytical method (Li et al, 2017;Shi et al, 2017;Wang 2019b), and detailed information is available elsewhere (Markovic et al, 2012;Rumsey et al, 2013). As a brief summary, ambient air is drawn into the systems at a flow rate of 16.7 L/min.…”

Section: Instrumentationsmentioning

confidence: 99%

“…reported that southern cities of Henan Province (e.g., Nanyang, Shangqiu, Zhoukou, and Zhumadian) had relatively higher ammonia emissions than the cities involved in this study. Moreover, the northern air masses from the Jing-Jin-Ji regions were easily enriched with sulfate (Wang et al, 2019b;Wang et al, 2018c). The concentrations of chemical composition under stagnant weather conditions in Case 2 clearly increased with average NH4 + , SO4 2− , and NO3 − concentrations that ranged from 12.8 ± 4.5 μg/m 3 (U-ZZ) to 45.5 ± 13.6 μg/m 3 (R-AY ), 30.9 ± 13.4 μg/m 3 (R-XX) to 44.1 ± 17.5 μg/m 3 (R-AY ), and 56.6 ± 19 μg/m 3 (U-AY) to 74.5 ± 20.7 μg/m 3 (R-AY ).…”

Section: Haze Episodesmentioning

confidence: 99%

Role of ammonia on fine-particle pH in agricultural regions of China: Comparison between urban and rural sites

Wang¹,

Wang²,

Li³

et al. 2019

Preprint

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Abstract. Particle acidity is a fundamental property that affects atmospheric particulate chemistry. Synchronous online monitoring was performed in two urban sites (e.g., Zhengzhou (U-ZZ) and Anyang (U-AY)) and three rural sites (e.g., Anyang (R-AY), Xinxiang (R-XX), and Puyang (R-PY)) in Henan Province during a haze episode to investigate the pH value and its driving factors in the agricultural regions of China. The pH values of particles calculated by ISORROPIA-II model at rural sites were slightly higher than those urban sites, with the median values in the order of 5.2 (4.8&#8211;6.9, R-PY) > 5.1 (4.7&#8211;6.5, R-AY) > 4.9 (4.1&#8211;6.8, R-XX) > 4.8 (3.9&#8211;5.9, U-AY) > 4.5 (3.8&#8211;5.2, U-ZZ). Sensitivity tests showed that excess ammonia mainly affected the pH value of PM2.5. Moreover, low ammonia determined the high sensitivities of particle pH to sulfate and nitrate at urban sites. Elevated sulfate and nitrate in aerosol caused high pH sensitivity to ammonia. Regional transport may enhance the particle pH value in urban aerosols given the high pH of particles and high ammonia levels in rural and agricultural regions. These results suggest that ammonia is urgently needed to be involved in the regional strategy for the improvement of air quality in China.

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Characterization of individual particles and meteorological conditions during the cold season in Zhengzhou using a single particle aerosol mass spectrometer

Cited by 19 publications

References 102 publications

Effect of ammonia on fine-particle pH in agricultural regions of China: comparison between urban and rural sites

Effect of ammonia on fine-particle pH in agricultural regions of China: comparison between urban and rural sites

Characterization of ambient volatile organic compounds, source apportionment, and the ozone-NO<sub>x</sub>-VOC sensitivities in a heavily polluted megacity of central China: Effect of sporting events and the emission reductions

Role of ammonia on fine-particle pH in agricultural regions of China: Comparison between urban and rural sites

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Characterization of individual particles and meteorological conditions during the cold season in Zhengzhou using a single particle aerosol mass spectrometer

Cited by 19 publications

References 102 publications

Effect of ammonia on fine-particle pH in agricultural regions of China: comparison between urban and rural sites

Effect of ammonia on fine-particle pH in agricultural regions of China: comparison between urban and rural sites

Characterization of ambient volatile organic compounds, source apportionment, and the ozone-NO&lt;sub&gt;x&lt;/sub&gt;-VOC sensitivities in a heavily polluted megacity of central China: Effect of sporting events and the emission reductions

Role of ammonia on fine-particle pH in agricultural regions of China: Comparison between urban and rural sites

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Characterization of ambient volatile organic compounds, source apportionment, and the ozone-NO<sub>x</sub>-VOC sensitivities in a heavily polluted megacity of central China: Effect of sporting events and the emission reductions