Article
Geosciences, Multidisciplinary
Sam J. Silva, Susannah M. Burrows, Mathew J. Evans, Mahantesh Halappanavar
Summary: Graph-theoretical methods have shown their importance in studying different atmospheric chemical mechanisms, revealing similarities and differences between them, and providing new possibilities for scientific discoveries.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Colleen B. Baublitz, Arlene M. Fiore, Sarah M. Ludwig, Julie M. Nicely, Glenn M. Wolfe, Roisin Commane, Michael J. Prather, Daniel C. Anderson, Gustavo Correa, Bryan N. Duncan, Melanie Follette- Cook, Daniel M. Westervelt, Ilann Bourgeois, William H. Brune, T. Paul Bui, Joshua P. Digangi, Glenn S. Diskin, Samuel R. Hall, Kathryn Mckain, David O. Miller, Jeff Peischl, Alexander B. Thames, Chelsea R. Thompson, Kirk Ullmann, Steven C. Wofsy
Summary: ProxyOH is developed as an observation-based proxy for spatial variations in hydroxyl radical (OH) in the remote marine troposphere. It scales linearly with in situ [OH] spatial variations and can be used to map OH variations over a large area.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Environmental Sciences
Guoxian Zhang, Renzhi Hu, Pinhua Xie, Keding Lu, Shengrong Lou, Xiaoyan Liu, Xin Li, Fengyang Wang, Yihui Wang, Xinping Yang, Haotian Cai, Yue Wang, Wenqing Liu
Summary: Atmospheric oxidation is a key factor in complex air pollution, and accurate OH measurement is crucial for understanding the photooxidation mechanism in the troposphere. The AIOFM-LIF instrument developed by the Anhui Institute of Optics Fine Mechanics, Chinese Academy of Sciences, provides high sensitivity and good time resolution for measuring OH concentration. A comparison with the PKU-LIF system showed excellent agreement in measurements.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Yuanhong Zhao, Marielle Saunois, Philippe Bousquet, Xin Lin, Michaela I. Hegglin, Josep G. Canadell, Robert B. Jackson, Bo Zheng
Summary: The estimated methane chemical sink by bottom-up methods is significantly higher than the estimates obtained by top-down methods. This difference is mainly due to the large uncertainties in the simulated concentrations of hydroxyl radicals (OH) by the atmospheric chemistry models used in bottom-up estimates. In this study, a new approach based on OH precursor observations and a chemical box model is proposed to improve the accuracy of OH distributions and reconcile the bottom-up and top-down estimates of methane loss. By constraining the simulated OH precursors with observations, the adjusted global mean tropospheric OH concentration ([OH](trop-M)) is around 10x10(5) molec. cm(-3), which is lower than the original model-simulated value and agrees with the top-down estimate. The adjusted methane chemical loss estimate is in line with the latest top-down estimate, contrary to the overestimated bottom-up estimates. The overestimation in global [OH](trop-M) and methane chemical loss by the models is primarily caused by the underestimation of carbon monoxide and total ozone column, and the overestimation of nitrogen dioxide. This study emphasizes the importance of constraining the model-simulated OH fields with available precursor observations to improve bottom-up estimates of the global methane sink.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Energy & Fuels
Zhilin Xi, Mengmeng Li, Xue Li, Linping Lu, Jiawei Wang
Summary: This study investigates the reaction mechanisms involving hydroxyl radicals in coal and the inhibitory effect of hydroxytyrosol on coal spontaneous combustion. The results suggest that hydroxyl radicals are primarily formed through the decomposition of peroxyl radicals, and then they participate in the oxidation reactions of hydrocarbons and oxygen-containing groups in coal. Hydroxytyrosol effectively removes free radicals from coal and inhibits coal spontaneous combustion.
Article
Engineering, Environmental
Nan Li, Tongcai Liu, Shaoze Xiao, Jiabin Chen, Yao Xu, Ruicheng Ji, Xuefei Zhou, Yalei Zhang
Summary: The addition of metal-free reducing agent thiosulfate (S2O32-) in Fenton reaction effectively addresses the issues of Fe(III) precipitation and slow Fe(III) reduction. The degradation of sulfamethoxazole (SMX) is significantly accelerated over a wide pH range (3.0-7.0) by S2O32-. The complexation and reduction role of S2O32- prevents the precipitation of iron ions and accelerates the reduction of Fe(III), leading to enhanced SMX degradation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Yang Guo, Yixin Zhang, Gang Yu, Yujue Wang
Summary: By comparing the conventional scavenger approach with the proposed probe approach, this study found that using probes can accurately reveal catalytic ozonation mechanisms and provide an effective way to assess the contribution of various ROS to pollutant abatement.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
N. Cazimir Armstrong, Yuzhi Chen, Tianqu Cui, Yue Zhang, Cade Christensen, Zhenfa Zhang, Barbara J. Turpin, Man Nin Chan, Avram Gold, Andrew P. Ault, Jason D. Surratt
Summary: This study examined the role of gas-phase hydroxyl radical in the heterogeneous oxidation of freshly generated IEPOX-SOA particles in the atmosphere. It was found that oligomers in IEPOX-SOA particles decompose through this reaction, maintaining a reservoir of low-volatility compounds. The study also proposed structures and formation mechanisms for previously uncharacterized SOA constituents in PM2.5, suggesting that this reaction may contribute to the atmospheric lifetimes of particle-phase IEPOX-SOA.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Lingwei Gao, Yang Guo, Juhong Zhan, Gang Yu, Yujue Wang
Summary: This study evaluated the effects of various quenchers on the mechanism of a cobalt mediated peroxymonosulfate (Co(II)/PMS) process and found that these quenchers not only quench target reactive species but also cause interference effects. Therefore, caution should be exercised when applying the quenching method to investigate the mechanism of the persulfate-based process.
Article
Engineering, Environmental
Yang Guo, Juhong Zhan, Gang Yu, Yujue Wang
Summary: During ozonation, the concentrations ratios of hydroxyl radicals, superoxide radicals and ozone remain constant, indicating the potential non-negligible role of superoxide radicals in the degradation of certain micropollutants with similar or higher reactivity compared to hydroxyl radicals. The proposed chemical kinetic model accurately simulates the abatement efficiencies of ozone-resistant micropollutants by considering the contribution of superoxide radicals, providing a valuable tool for predicting micropollutant removal during ozonation.
Article
Engineering, Environmental
Meryem Soyluoglu, Daekyun Kim, Yeakub Zaker, Tanju Karanfil
Summary: This study investigated the application of nanobubble technology in controlling geosmin and MIB, and examined their removal mechanisms. Volatilization and oxidation were found to be the main removal mechanisms, with alkalinity and temperature affecting their removal efficiency to some extent.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Taikang Yuan, Xudong Wang, Xiaochen Zhao, Tingting Liu, Hongmin Zhang, Yongtao Lv, Lei Wang
Summary: The study investigated and compared the degradation of minocycline in aqueous solution using natural bornite-activated hydrogen peroxide (H2O2) and persulfate processes (PS). The results showed that the mineralization rate of NBo/PS was higher than that of NBo/H2O2, and the main activated species differed between the two systems. Reusability of NBo as activator for MNC degradation was also proven to be cost-effective and stable. This work provides a new perspective on the degradation mechanism of pollutants by Fe-Cu bimetallic sulfide activation of PS and H2O2.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Matilda A. Pimlott, Richard J. Pope, Brian J. Kerridge, Barry G. Latter, Diane S. Knappett, Dwayne E. Heard, Lucy J. Ventress, Richard Siddans, Wuhu Feng, Martyn P. Chipperfield
Summary: This study presents a novel approach to indirectly derive global information on the hydroxyl radical (OH) using satellite observations and a steady-state approximation. The results show that a simplified steady-state approximation can accurately represent OH concentrations, as validated by satellite and aircraft measurements. The study also reveals the global inter-annual variability of OH and identifies ozone and carbon monoxide as the key drivers of this variability.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Review
Environmental Sciences
Monserrat Castaneda-Juarez, Ivonne Linares-Hernandez, Veronica Martinez-Miranda, Elia Alejandra Teutli-Sequeira, Luis Antonio Castillo-Suarez, Ana Gabriela Sierra-Sanchez
Summary: This review summarizes research data on pharmaceutical drugs used to treat the novel SARS-CoV-2 virus, their characteristics, environmental impacts, and the advanced oxidation processes (AOP) used to remove them. The results show that AOPs are a promising solution for minimizing the environmental impact of these compounds. Photocatalysis is currently the main technology used for removing these drugs, but there are limitations in large-scale practical applications. Additionally, the diverse and complex nature of pharmaceuticals in the environment is discussed.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Environmental Sciences
Yanhui Liu, Jiayin Li, Yufang Ma, Ming Zhou, Zhaofeng Tan, Limin Zeng, Keding Lu, Yuanhang Zhang
Summary: The atmospheric chemical mechanism plays a crucial role in airshed models for studying chemical behaviors and impacts. Various mechanisms, such as MCM, CBM, SAPRC, and RACM, have been developed for different research purposes. This article summarizes the development and applications of these mechanisms, compares their compositions and methods, and examines how they treat radicals in box model simulations. CBM can effectively reproduce urban pollution events at a lower cost compared to SAPRC and RACM, while RACM provides a detailed description of radicals and ozone production. SAPRC07 has lower photolysis rates for some oxygenated compounds, leading to an underestimation of radical levels. MCM is an explicit chemical mechanism that describes primary pollutants and oxidation products in detail but is rarely used in regional model simulations due to its large size. Results from box model case studies show that all mechanisms accurately describe the behavior of radicals and the production of ozone. However, CBM and SAPRC tend to underestimate radical levels, resulting in lower ozone production values. MCM and RACM are commonly used in box model studies, while CBM and SAPRC are preferred in regional simulations.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Engineering, Environmental
James R. Campbell, Michael Battaglia, Kayane Dingilian, Meeta Cesler-Maloney, Jason M. St Clair, Thomas F. Hanisco, Ellis Robinson, Peter DeCarlo, William Simpson, Athanasios Nenes, Rodney J. Weber, Jingqiu Mao
Summary: Fairbanks, Alaska experiences poor air quality in winter due to atmospheric inversions, local emissions, and unique chemistry caused by cold and dark conditions. This study focuses on the high concentrations of fine particle hydroxymethanesulfonate (HMS) and its links to inorganic sulfate and organic mass in pollution episodes, highlighting the formation of air pollution in cold and humid atmospheres.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Meteorology & Atmospheric Sciences
Meeta Cesler-Maloney, William R. Simpson, Tate Miles, Jingqiu Mao, Kathy S. Law, Tjarda J. Roberts
Summary: This study investigates the vertical differences of PM2.5 and O-3 concentrations in the atmosphere of Fairbanks, Alaska during winter. The results show that pollution is mixed to altitudes below 20 m AGL during surface-based temperature inversions, leading to significant differences in pollutant concentrations between 3 m and 20 m AGL. Additionally, the oxidation regime of the atmosphere changes with different O-3 mixing ratios during surface-based temperature inversions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Multidisciplinary Sciences
William H. Brune, Jena M. Jenkins, Gabrielle A. Olson, Patrick J. McFarland, David O. Miller, Jingqiu Mao, Xinrong Ren
Summary: Atmospheric electrical discharges, specifically corona formed on grounded metal objects under thunderstorms, generate significant amounts of OH, HO2, and O-3. Field measurements and laboratory experiments show that corona on lightning rods and high-voltage power lines can produce concentrations of OH that are significantly higher than ambient levels.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Engineering, Environmental
Joel Dreessen, Xinrong Ren, Daniel Gardner, Katherine Green, Phillip Stratton, John T. Sullivan, Ruben Delgado, Russ R. Dickerson, Michael Woodman, Tim Berkoff, Guillaume Gronoff, Allison Ring
Summary: The OWLETS-2 study found that the concentrations of TNMHC and VOCs on an island site in the northern Chesapeake Bay were 2.1 and 3.4 times higher, respectively, than those at a nearby land site. The chemical differences between the island and land sites were observed both in the air above the water and on the water surface. The VOC and photochemistry patterns at the island site were mainly driven by marine sources, indicating the need for separate ozone abatement strategies for water and land.
JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
(2023)
Article
Chemistry, Multidisciplinary
Anita M. Avery, Mitchell W. Alton, Manjula R. Canagaratna, Jordan E. Krechmer, Donna T. Sueper, Nirvan Bhattacharyya, Lea Hildebrandt Ruiz, William H. Brune, Andrew T. Lambe
Summary: Cyclic volatile methyl siloxanes (cVMS) emitted from industrial processes and consumer products dominate the presence of volatile organic compounds (VOCs) in occupied spaces. These cVMS can undergo oxidation by gas-phase radicals, such as hydroxyl radicals (OH) and chlorine atoms (Cl), leading to the formation of secondary organic aerosols (SOA). While the SOA formation potential of cVMS with OH has been studied, the impact of Cl oxidation on SOA formation has not been explored.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Environmental Sciences
Dolly L. Hall-Quinlan, Hao He, Xinrong Ren, Timothy P. Canty, Ross J. Salawitch, Phillip Stratton, Russell R. Dickerson
Summary: Vehicles are a major source of carbon monoxide (CO), nitrogen oxides (NOx), and black carbon (BC) emissions, which have negative impacts on both human health and the environment. The COVID-19 pandemic and the resulting travel restrictions have provided an opportunity to study the effects of reduced traffic on local air quality. The study found significant reductions in vehicle emissions and improvements in air quality during the pandemic.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Environmental Sciences
Allison M. Ring, Russell R. Dickerson, Abby E. Sebol, Xinrong Ren, Sarah E. Benish, Ross J. Salawitch, Andrea Galasyn, Paul J. Miller, Timothy P. Canty
Summary: Cities like New York and areas downwind have poor air quality due to pollution generated by human activity. Ozone (O-3), a harmful pollutant, is produced in the atmosphere from photochemical reactions involving volatile organic compounds (VOCs) and nitrogen oxides (NOx). Aircraft measurements of VOCs obtained during an O3 event in May 2017 over the New York City metropolitan area, Long Island Sound, and Connecticut show concentrations of O-3 exceeding 100 ppb between similar to 200 and 500 m above the surface.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Katherine R. Travis, James. H. Crawford, Amber J. Soja, Emily M. Gargulinski, Richard H. Moore, Elizabeth B. Wiggins, Glenn S. Diskin, Joshua P. Digangi, John B. Nowak, Hannah Halliday, Robert J. Yokelson, Jessica L. Mccarty, Isobel J. Simpson, Donald R. Blake, Simone Meinardi, Rebecca S. Hornbrook, Eric C. Apel, Alan J. Hills, Carsten Warneke, Matthew M. Coggon, Andrew W. Rollins, Jessica B. Gilman, Caroline C. Womack, Michael A. Robinson, Joseph M. Katich, Jeff Peischl, Georgios I. Gkatzelis, Ilann Bourgeois, Pamela S. Rickly, Aaron Lamplugh, Jack E. Dibb, Jose L. Jimenez, Pedro Campuzano-Jost, Douglas A. Day, Hongyu Guo, Demetrios Pagonis, Paul O. Wennberg, John D. Crounse, Lu Xu, Thomas F. Hanisco, Glenn M. Wolfe, Jin Liao, Jason M. St. Clair, Benjamin A. Nault, Alan Fried, Anne E. Perring
Summary: Agricultural and prescribed burning activities emit significant amounts of trace gases and aerosols. This study presents emission factors and ratios based on the FIREX-AQ campaign in the eastern United States in 2019, focusing on burning of crop residues and prescribed fire fuels. The study shows the importance of specific factors such as combustion efficiency, fuel type, and meteorological conditions in determining the emissions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Yiqi Zheng, Larry W. W. Horowitz, Raymond Menzel, David J. Paynter, Vaishali Naik, Jingyi Li, Jingqiu Mao
Summary: Biogenic secondary organic aerosols (SOAs), originating from both natural and anthropogenic sources, contribute significantly to the fine aerosols globally and have impacts on air quality and climate. The formation of biogenic SOAs is influenced by emissions of biogenic volatile organic compounds (BVOCs) as well as anthropogenic pollutants such as primary organic aerosol, sulfur dioxide (SO2), and nitrogen oxides (NOx). However, the extent of anthropogenic impact on biogenic SOA production (AIBS) is still not well understood.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(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
Ellis S. S. Robinson, Meeta Cesler-Maloney, Xinxiu Tan, Jingqiu Mao, William Simpson, Peter F. F. DeCarlo
Summary: Fairbanks-North Star Borough (FNSB), Alaska consistently has extremely poor wintertime air quality. The ALPACA field campaign aimed to understand the sources and transformations of air pollution and the meteorological conditions impacting FNSB's air quality. The study found that there are significant variations in PM2.5 concentrations and composition both between and within neighborhoods, which are closely related to meteorological conditions. The results also showed that elevation and temperature inversions have a significant impact on PM levels and composition.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2023)
Article
Environmental Sciences
Rui Zhang, Yuying Wang, Zhanqing Li, Zhibin Wang, Russell R. Dickerson, Xinrong Ren, Hao He, Fei Wang, Ying Gao, Xi Chen, Jialu Xu, Yafang Cheng, Hang Su
Summary: This study investigates the characteristics of aerosol activation ability and optical properties over the North China Plain. The results show that the aerosol activation ability is influenced by air mass sources, temperature structure, anthropogenic emissions, and terrain distribution. Aerosols have a stronger activation ability in southeasterly air masses and in the free atmosphere. The aerosol scattering properties are mainly influenced by primary emissions near the surface and long-distance transport in the free troposphere. A parameterization method based on aerosol optical properties can effectively estimate the aerosol activation number concentration.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Tianlang Zhao, Jingqiu Mao, William R. Simpson, Isabelle De Smedt, Lei Zhu, Thomas F. Hanisco, Glenn M. Wolfe, Jason M. St Clair, Gonzalo Gonzalez Abad, Caroline R. Nowlan, Barbara Barletta, Simone Meinardi, Donald R. Blake, Eric C. Apel, Rebecca S. Hornbrook
Summary: This study investigates the variability and sources of summertime formaldehyde (HCHO) in Alaska using satellite observations, aircraft measurements, and a regional chemical transport model. The results suggest that background HCHO is the dominant contributor to HCHO column density, while wildfires and biogenic VOC emissions contribute less.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
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)