Article
Environmental Sciences
Beata Opacka, Jean-Francois Muller, Trissevgeni Stavrakou, Diego G. Miralles, Akash Koppa, Brianna Rita Pagan, Mark J. Potosnak, Roger Seco, Isabelle De Smedt, Alex B. Guenther
Summary: Terrestrial vegetation emits biogenic volatile organic compounds (BVOCs), which have significant impacts on the tropospheric oxidizing potential, air quality, and climate. This study finds that the current emission model fails to accurately represent the reduction in isoprene emissions during severe droughts. By updating the parameterization based on recent measurements, the study provides a better representation of isoprene emissions.
Article
Environmental Sciences
Jiexiao Xue, Ting Zhao, Yifu Luo, Congke Miao, Pinjie Su, Feng Liu, Guohui Zhang, Sida Qin, Youtao Song, Naishun Bu, Chengzhi Xing
Summary: The study measured tropospheric formaldehyde (HCHO) concentrations in Shenyang, China using MAX-DOAS, and discussed the sources of HCHO and its sensitivity to O-3 production.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Environmental Sciences
Guochun Lv, Heng Zhang, Xiaomin Sun
Summary: The study investigated the initial reaction mechanism of methyl vinyl ketone (MVK) by SO3- radicals and the subsequent sulfonate formation processes using DFT calculation. The results showed that dissolved O-2 addition to the initial product is more favorable. The produced peroxyl radical can form alcohols and ketones through bimolecular self-reactions and bimolecular reactions with other species such as HSO3-.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Kai Xu, Yafei Liu, Feng Li, Chenlu Li, Chen Zhang, Huan Zhang, Xingang Liu, Qijie Li, Min Xiong
Summary: Wuhan implemented strict measures to prevent the spread of COVID-19 from January 26 to April 7, 2020. The resulting lock-down led to a decrease in atmospheric pollutants, with the exception of ozone (O-3). This study investigated the factors contributing to the increase in O-3 during the lock-down period, and found that the O-3 formation regime was NOX-limited. The lower nitric oxide (NO) concentrations and reduced wind speed (WS) at night were found to explain the accumulation of O-3.
ENVIRONMENTAL POLLUTION
(2023)
Article
Chemistry, Multidisciplinary
Fatima El Ouahabi, Wietse Smit, Carlo Angelici, Mykola Polyakov, Uwe Rodemerck, Christine Fischer, V. Narayana Kalevaru, Sebastian Wohlrab, Sergey Tin, Gerard P. M. van Klink, Jan C. van der Waal, Francois Orange, Johannes G. de Vries
Summary: A high-throughput screening identified 5 wt% Pt on sulfided carbon as the best catalyst for the conversion of biobased methyl levulinate (ML) to methyl vinyl ketone (MVK). The study suggests that the reaction mechanism involves the formation of alpha-angelica lactone (alpha-AL) as the most likely intermediate. Furthermore, the research revealed the potential for high-temperature conversion of the biobased compound to MVK.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Environmental Sciences
Qianqian Hong, Linbin Zhu, Chengzhi Xing, Qihou Hu, Hua Lin, Chengxin Zhang, Chunhui Zhao, Ting Liu, Wenjing Su, Cheng Liu
Summary: In Guangzhou, China, it was found that vertical profiles of formaldehyde and aerosol are more sensitive to O3 pollution in the late afternoon and at noon at higher altitudes, while the vertical profile of nitrogen dioxide exhibits an exponential decreasing shape, indicating lower sensitivity to O3 pollution.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Peter Weidner, Amelia W. Ray, Andras Bodi, Balint Sztaray
Summary: The dissociative photoionization of methyl vinyl ketone has been studied using photoelectron photoion coincidence spectroscopy, revealing four main fragment ions. The formation mechanisms of these ions are proposed based on experimental results.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Physical
Behnam Nikoobakht
Summary: The spectroscopy of MVK-oxide was studied theoretically, considering two interacting electronic states and two nuclear degrees of freedom, with the computed absorption spectrum showing agreement with experimental recordings. Weak oscillatory structures in the absorption spectrum are likely due to the excitation energy range being below the energy barrier of the diabatic B state.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Behnam Nikoobakht
Summary: The spectroscopic properties of the four-carbon Criegee intermediate, methyl vinyl ketone oxide (MVK-oxide), have been investigated theoretically. The results agree well with experimental measurements, and the weak oscillatory structures in the absorption spectrum are suggested to originate from the recurrence of the wavepacket. The electronic excitation profile of MVK-oxide is predicted to peak at 373 nm.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Environmental Sciences
Shailaja Wasti, Yuxuan Wang
Summary: This study investigates the impact of drought on HCHO concentration in South Korea and finds that drought leads to an increase in HCHO, which is correlated with the vegetation percentage of the region.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Physical
Zhaoyan Zhang, Chong Wang, Yingqi Zhao, Ya Zhao, Gang Li, Hua Xie, Ling Jiang
Summary: In this study, the autoxidation of volatile organic compounds (VOCs) in the atmosphere was theoretically investigated using methacrolein (MACR) as the example. The results revealed that MACR's Cladducts and H-abstraction products react with O2 and undergo isomerizations via H-shift and cyclization, leading to the formation of a diverse range of lowly and highly oxygenated organic molecules. Furthermore, the first and third-generation oxidation products derived from the Cl-adducts and the methyl-H abstraction complexes dominate the atmospheric autoxidation, with their yields significantly influenced by NO concentration. These findings are of great importance for a systematic understanding of the oxidation processes of isoprene-derived compounds in atmospheric environments.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Insaf Toumi, Samira Dalbouha, Muneerah Mogren Al-Mogren, Ounaies Yazidi, Nejm-Eddine Jaidane, Miguel Carvajal, Maria Luisa Senent
Summary: In this study, two ketones of atmospheric interest, methyl glyoxal and methyl vinyl ketone, were investigated using coupled cluster theory and basis sets. The research focused on the far-infrared region and provided insights into the rotational constants, conformers, and vibrational parameters of the molecules.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Spectroscopy
Carlos Cabezas, Marcos Juanes, Rizalina T. Saragi, Alberto Lesarri, Isabel Pena
Summary: In this study, the interaction between methyl vinyl ketone and water was investigated using high-resolution microwave spectroscopy combined with quantum chemistry calculations. The results showed the formation of four isomers connected by O-H···O and C-H···O hydrogen bonds, with water preferentially binding to the antiperiplanar conformation of methyl vinyl ketone. Evidence of a large amplitude motion arising from the methyl internal rotation was observed in the rotational spectra.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Physical
Hyun Kyung Lee, Pitchaya Chantanapongvanij, Rory R. Schmidt, Thomas A. Stephenson
Summary: Master equation simulations were conducted to study the unimolecular reaction dynamics of MACR oxide under different temperature and pressure conditions. The simulations revealed the temperature-dependent variation of the unimolecular kinetics in the range of 288-320 K. This work incorporated a new potential energy surface and considered the conformational dynamics as well as the formation of dioxirane and dioxole species. The competition between unimolecular reactivity and the previously documented bimolecular reactivity with water vapor was explored, with a focus on the influence of atmospheric conditions. The role of MACR oxide as an atmospheric oxidant of SO2 was also highlighted.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Environmental Sciences
Amir H. Souri, Matthew S. Johnson, Glenn M. Wolfe, James H. Crawford, Alan Fried, Armin Wisthaler, William H. Brune, Donald R. Blake, Andrew J. Weinheimer, Tijl Verhoelst, Steven Compernolle, Gaia Pinardi, Corinne Vigouroux, Bavo Langerock, Sungyeon Choi, Lok Lamsal, Lei Zhu, Shuai Sun, Ronald C. Cohen, Kyung-Eun Min, Changmin Cho, Sajeev Philip, Xiong Liu, Kelly Chance
Summary: The use of the ratio between formaldehyde (HCHO) and nitrogen dioxide (NO2) tropospheric columns from ultraviolet-visible (UV-Vis) satellites has been motivated by the availability of these data, allowing researchers to gain insights into near-surface ozone sensitivity.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Muhammad Waqas, Majid Nazeer, Man Sing Wong, Wu Shaolin, Li Hon, Joon Heo
Summary: The socio-economic restriction measures implemented in the United States have significantly reduced nitrogen dioxide (NO2) emissions. The study highlights the impact of factors such as human mobility, population density, income, climate, and stationary sources on the reduction of NO2 at different stations. The research emphasizes the scientific impacts of the NO2 reduction and income inequality revealed by the pandemic on air quality and health disparities.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Guorui Zhi, Jinhong Du, Aizhong Chen, Wenjing Jin, Na Ying, Zhihui Huang, Peng Xu, Di Wang, Jinghua Ma, Yuzhe Zhang, Jiabao Qu, Hao Zhang, Li Yang, Zhanyun Ma, Yanjun Ren, Hongyan Dang, Jianglong Cui, Pengchuan Lin, Zhuoshi He, Jinmin Zhao, Shuo Qi, Weiqi Zhang, Wenjuan Zhao, Yingxin Li, Qian Liu, Chen Zhao, Yi Tang, Peng Wei, Jingxu Wang, Zhen Song, Yao Kong, Xiangzhe Zhu, Yi Shen, Tianning Zhang, Yangxi Chu, Xinmin Zhang, Jiafeng Fu, Qingxian Gao, Jingnan Hu, Zhigang Xue
Summary: An comprehensive emission inventory for China in 2019, which includes both air pollutants and greenhouse gases, was developed in this study. The inventory utilizes existing frameworks and data to provide comparable emissions data and demonstrates the relationship between emissions and economic development.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
I-Ting Ku, Yong Zhou, Arsineh Hecobian, Katherine Benedict, Brent Buck, Emily Lachenmayer, Bryan Terry, Morgan Frazier, Jie Zhang, Da Pan, Lena Low, Amy Sullivan, Jeffrey L. Collett Jr
Summary: Unconventional oil and natural gas development (UOGD) in the United States has expanded rapidly in recent decades, raising concerns about its impact on air quality. This study conducted extensive air monitoring during the development of several large well pads in Broomfield, Colorado, providing a unique opportunity to examine changes in local air toxics and VOC concentrations during well drilling and completions and production. The study identified significant increases in VOC concentrations during drilling operations, highlighting the importance of emissions from synthetic drilling mud. The findings suggest opportunities to mitigate emissions during UOGD operations.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Puji Lestari, Akbar R. Tasrifani, Wiranda I. Suri, Martin J. Wooster, Mark J. Grosvenor, Yusuke Fujii, Vissia Ardiyani, Elisa Carboni, Gareth Thomas
Summary: This study developed field emission factors for various pollutants in peatland fires and estimated the total emissions. Gas samples were collected using an analyzer, while particulate samples were collected using air samplers. The study found significant emissions of CO2, CO, PM2.5, carbon aerosols, water-soluble ions, and elements from the fires in Central Kalimantan, Indonesia in 2019.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Ligang Li, Yuyu Chen, Lu Fan, Dong Sun, Hu He, Yongshou Dai, Yong Wan, Fangfang Chen
Summary: A high-precision retrieval method based on a deep convolutional neural network and satellite remote sensing data is proposed to obtain accurate methane vertical profiles.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Hyung Joo Lee, Toshihiro Kuwayama, Michael Fitzgibbon
Summary: This study investigated the changes in nitrogen dioxide (NO2) air pollution levels and their disparities in California, U.S. during the pandemic of coronavirus disease 2019 (COVID-19). The results showed a decrease in NO2 concentrations, especially in urban and high-traffic areas. However, socially vulnerable populations still experienced higher levels of NO2 exposure. The study suggests that reducing NO2 disparities, particularly racial inequity, can be achieved through continued regulatory actions targeting traffic-related NOx emissions.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Maria Chiara Pietrogrande, Beatrice Biffi, Cristina Colombi, Eleonora Cuccia, Umberto Dal Santo, Luisa Romanato
Summary: This study investigates the chemical composition and oxidative potential of PM10 particles in the Po Valley, Italy, and demonstrates the impact of high levels of atmosphere ammonia. The rural area had significantly higher ammonia concentrations compared to the urban site, resulting in higher levels of secondary inorganic aerosol. Although the SIA components did not contribute significantly to the PM10 oxidative reactivity, they were correlated with the oxidative potential measurements. This suggests that the contribution of SIA to PM oxidative toxicity cannot be ignored.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Natalie Allen, Jan Gacnik, Sarrah M. Dunham-Cheatham, Mae Sexauer Gustin
Summary: Accurate measurement of atmospheric reactive mercury is challenging due to its reactivity and low concentrations. The University of Nevada, Reno Reactive Mercury Active System (RMAS) has been shown to be more accurate than the industry standard, but has limitations including long time resolution and sampling biases. Increasing the sampling flow rate negatively affected RM concentrations, but did not impact the chemical composition of RM captured on membranes.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Chin-Yu Hsu, Wei-Ting Hsu, Ching-Yi Mou, Pei-Yi Wong, Chih-Da Wu, Yu-Cheng Chen
Summary: This study estimated the daily exposure concentrations of PM2.5 for elderly individuals residing in different regions of Taiwan using land use regression with machine learning (LUR_ML) and microenvironmental exposure (ME) models. The accuracy of the models varied across regions, with the ME models exhibiting higher predictions and lower biases. The use of region-specific microenvironmental measurements in the ME model showed potential for accurate prediction of personal PM2.5 exposure.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Xiaohan Si, Kerrie Mengersen, Chuchu Ye, Wenbiao Hu
Summary: This study found that there is an interactive effect between air pollutants and weather factors, which significantly affects influenza transmission. Future research should consider the interactive effects between pollutants and temperature or humidity to evaluate the environment-influenza association.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Luxi Xu, Ruijun Xu, Yunshao Ye, Rui Wang, Jing Wei, Chunxiang Shi, Qiaoxuan Lin, Ziquan Lv, Suli Huang, Qi Tian, Yuewei Liu
Summary: This study aimed to evaluate the impact of ambient air pollution on hospital admissions for angina. The results showed that exposure to ambient particulate matter, sulfur dioxide, nitrogen dioxide, carbon monoxide, and ozone are associated with an increased risk of hospital admissions for angina. The association with nitrogen dioxide exposure was found to be the strongest.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Xinyu Yu, Man Sing Wong, Majid Nazeer, Zhengqiang Li, Coco Yin Tung Kwok
Summary: This study proposes a novel method to address the challenge of missing values in satellite-derived AOD products and creates a comprehensive daily AOD dataset for the Guangdong-Hong Kong-Macao Greater Bay Area. By reconstructing missing values and developing a new model, the derived dataset outperforms existing products and agrees well with ground-based observations. Additionally, the dataset exhibits consistent temporal patterns and more spatial details.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Yidan Zhang, Yifan Xu, Bo Peng, Wu Chen, Xiaoyu Cui, Tianle Zhang, Xi Chen, Yuan Yao, Mingjin Wang, Junyi Liu, Mei Zheng, Tong Zhu
Summary: This study developed a sensitive method to measure the metallic components of atmospheric fine particulate matter (PM2.5) and compared the results with different analysis methods. The concentrations of metallic components in personal PM2.5 samples were found to be significantly different from corresponding fixed-site samples. Personal sampling can reduce exposure misclassifications, and measuring metallic components is useful for exploring health risks and identifying sources of PM2.5.
ATMOSPHERIC ENVIRONMENT
(2024)
Review
Environmental Sciences
Jamie Leonard, Lea Ann El Rassi, Mona Abdul Samad, Samantha Prehn, Sanjay K. Mohanty
Summary: Increasing concentrations of microplastics in the Earth's atmosphere could have adverse effects on ecosystems and human health. The deposition rate of airborne microplastics is influenced by both land use and climate, and a global analysis suggests that climate may have a greater impact on the concentration and deposition rate of microplastics than land use.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Tian Zhou, Xiaowen Zhou, Zining Yang, Carmen Cordoba-Jabonero, Yufei Wang, Zhongwei Huang, Pengbo Da, Qiju Luo, Zhijuan Zhang, Jinsen Shi, Jianrong Bi, Hocine Alikhodja
Summary: This study investigated the long-range transport and effects of North African and Middle Eastern dust in East Asia using lidar observations and model simulations. The results showed that the dust originated from multiple sources and had a long transport time. The vertical distribution of the dust was found to be crucial for assessing its impacts.
ATMOSPHERIC ENVIRONMENT
(2024)