199 results match your criteria aod decreased


Estimating the Impact of COVID-19 on the PM Levels in China with a Satellite-Driven Machine Learning Model.

Remote Sens (Basel) 2021 Apr 1;13(7). Epub 2021 Apr 1.

Gangarosa Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA 30322, USA.

China implemented an aggressive nationwide lockdown procedure immediately after the COVID-19 outbreak in January 2020. As China emerges from the impact of COVID-19 on national economic and industrial activities, it has become the site of a large-scale natural experiment to evaluate the impact of COVID-19 on regional air quality. However, ground measurements of fine particulate matters (PM) concentrations do not offer comprehensive spatial coverage, especially in suburban and rural regions. Read More

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Contrasting seasonal pattern between ground-based PM and MODIS satellite-based aerosol optical depth (AOD) at an urban site in Hanoi, Vietnam.

Environ Sci Pollut Res Int 2021 Sep 16. Epub 2021 Sep 16.

Graduate Institute of Applied Geology, National Central University, Taoyuan, 32000, Taiwan.

This study investigated the seasonal variations of the ground-based PM concentration measured at an urban site and Terra MODIS satellite-based aerosol optical depth (AOD) in Hanoi, Vietnam, during the year 2016. The findings showed the large differences in terms of the seasonal variation of both PM concentration and columnar AOD. Clearly, the ground-based PM concentrations decreased during the summer period and highly increased during the late fall and winter periods. Read More

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September 2021

The change of anterior chamber angle parameters after cataract surgery in diabetic patients.

Ther Adv Ophthalmol 2021 Jan-Dec;13:25158414211034717. Epub 2021 Aug 10.

Department of Ophthalmology, Sisli Hamidiye Etfal Training and Research Hospital, University of Health Sciences, Istanbul, Turkey.

Purpose: The purpose of this study is to investigate the change of anterior chamber angle morphology after cataract surgery in patients with type 2 diabetes mellitus (DM2) using anterior segment optical coherence tomography (AS-OCT).

Methods: In this prospective and comparative study, 57 eyes of the patients with cataract were investigated. The patients were divided into two groups. Read More

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Identifying as American Indian/Alaska Native in Urban Areas: Implications for Adolescent Behavioral Health and Well-Being.

Youth Soc 2021 Jan 3;53(1):54-75. Epub 2019 Apr 3.

RAND Corporation, Santa Monica, CA, USA.

American Indian and Alaska Native (AI/AN) youth exhibit multiple health disparities, including high rates of alcohol and other drug (AOD) use, violence and delinquency, and mental health problems. Approximately 70% of AI/AN youth reside in urban areas, where negative outcomes on behavioral health and well-being are often high. Identity development may be particularly complex in urban settings, where youth may face more fragmented and lower density AI/AN communities, as well as mixed racial-ethnic ancestry and decreased familiarity with AI/AN lifeways. Read More

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January 2021

Environmental factors modulate the diffuse fertilization effect on gross primary productivity across Chinese ecosystems.

Sci Total Environ 2021 Nov 19;793:148443. Epub 2021 Jun 19.

Key Laboratory of Regional Ecology and Environmental Change, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China.

Diffuse radiation allocated by cloud cover and aerosols can promote vegetation photosynthesis, which is known as the diffuse fertilization effect (DFE). As an important uncertain factor regulating the DFE, understanding the role of environmental conditions in the response of terrestrial ecosystems to diffuse radiation is vital for quantitative and intensive studies. By using a light use efficiency model and statistical methods with satellite data and ChinaFLUX observation data, the optimal environmental range of DFE was estimated, the indirect role of vapor pressure deficit (VPD) and air temperature (T) on DFE was explored, and the relative contribution of diffuse photosynthetically active radiation (PAR) on gross primary productivity (GPP) was analyzed across Chinese ecosystems under different sky conditions. Read More

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November 2021

Project Khanya: results from a pilot randomized type 1 hybrid effectiveness-implementation trial of a peer-delivered behavioural intervention for ART adherence and substance use in HIV care in South Africa.

J Int AIDS Soc 2021 Jun;24 Suppl 2:e25720

Department of Psychology, University of Miami, Miami, FL, USA.

Introduction: South Africa (SA) has the highest number of people living with HIV (PLWH) globally, and a significant burden of alcohol and other drug use (AOD). Although integrating AOD treatment into HIV care may improve antiretroviral therapy (ART) adherence, this is not typically routine practice in SA or other low-resource settings. Identifying interventions that are feasible and acceptable for implementation is critical to improve HIV and AOD outcomes. Read More

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Analysis of Iris volume using swept-source optical coherence tomography in patients with type 2 diabetes mellitus.

Acta Ophthalmol 2021 Jun 16. Epub 2021 Jun 16.

State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China.

Purpose: To evaluate iris volume before and after pupil dilation using swept-source anterior segment optical coherence tomography (SS-ASOCT) and investigate the associated factors of iris volume and iris volume change after pupil dilation in patients with type 2 diabetes mellitus (T2DM).

Methods: A cross-sectional study was conducted in Zhongshan Ophthalmic Center among T2DM registered patients in the community of Guangzhou, China. Anterior chamber volume (ACV), iris volume, anterior chamber depth (ACD), angle opening distance at 500 μm (AOD 500) and pupil diameter were estimated using SS-ASOCT (CASIA; Tomey, Nagoya, Japan). Read More

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Reduction of surface radiative forcing observed from remote sensing data during global COVID-19 lockdown.

Atmos Res 2021 Oct 11;261:105729. Epub 2021 Jun 11.

Collaborative Innovation Centre on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Meteorological Disaster, Ministry of Education, International Joint Laboratory on Climate and Environment Change, Key laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China.

The calamity of the COVID-19 pandemic during the early half of 2020 not only caused a huge physical and economic loss but altered the social behavior of the whole world. The social and economic stagnation imposed in many countries and served as a major cause of perturbation in atmospheric composition. This paper utilized the relation between atmospheric composition and surface radiation and analyzed the impact of global COVID-19 lockdown on land surface solar and thermal radiation. Read More

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October 2021

Decadal variations in natural and anthropogenic aerosol optical depth over the Bay of Bengal: the influence of pollutants from Indo-GangeticPlain.

Environ Sci Pollut Res Int 2021 Jun 15. Epub 2021 Jun 15.

CSIR-National Institute of Oceanography, 176 Lawsons Bay Colony, Visakhapatnam, 530017, India.

Perennial increase in atmospheric pollution over the Bay of Bengal (BoB) and South China Sea is reported due to increase in human population and industrial activity in South and Southeast Asia. Based on total aerosol optical depth (AOD) derived from MODIS (moderate resolution imaging resolution imaging spectroradiometer), natural and anthropogenic fractions were derived. The seasonality and spatial variability in rate of increase in total, natural, and anthropogenic AOD fractions were examined over the BoB using data collected between 2001 and 2019. Read More

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Anterior Chamber Measurements in Healthy Children: A Cross-Sectional Study Using Optical Coherence Tomography.

Transl Vis Sci Technol 2021 05;10(6):13

University of Leicester Ulverscroft Eye Unit, Department of Neuroscience, Psychology and Behaviour, University of Leicester, Leicester, UK.

Purpose: To establish anterior chamber measurements in children and investigate the influence of demographic factors on anterior chamber development.

Methods: Handheld optical coherence tomography was used to scan the anterior chamber of participants' eyes, without sedation. ImageJ was used to generate quantitative anterior chamber measurements, including central corneal thickness (CCT), anterior chamber width, trabecular meshwork length (TML), Schwalbe's line-angle opening distance (SL-AOD), and trabecular iris surface area (SL-TISA). Read More

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Effect of High Myopia on Dynamic Changes of Anterior Angle After Pharmacologic Mydriasis in Cataract Patients: A SS-ASOCT Study.

Transl Vis Sci Technol 2021 05;10(6):25

State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, Guangdong, China.

Purpose: The purpose of this study was to evaluate the effect of high myopia on anterior angle change after pharmacologic mydriasis in patients with cataract using swept-source anterior segment optical coherence tomography (SS-ASOCT).

Methods: This prospective cross-sectional study continuously recruited patients with cataract aged 40 years and older during the period August 2019 to August 2020. The anterior segment parameters, including central corneal thickness (CCT), anterior chamber depth (ACD), angle opening distance (AOD), angle recess area (ARA), trabecular iris space area (TISA), trabecular-iris angle (TIA), angle to angle width (ATA), and anterior chamber volume (ACV), were obtained using SS-ASOCT at baseline and 30 minutes after mydriasis. Read More

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Intraocular pressure changes after phacoemulsification in pseudoexfoliation versus healthy eyes.

BMC Ophthalmol 2021 May 6;21(1):198. Epub 2021 May 6.

Clinical Research Development Center, Imam Khomeini and Mohammad Kermanshahi and Farabi Hospitals, Kermanshah University of Medical Sciences, Kermanshah, Iran.

Background: Pseudoexfoliation (PXF) syndrome is the most common cause of secondary glaucoma worldwide. This systemic disorder causes further damage to the optic nerve and ultimately increases the need for surgical interventions. Therefore, intraocular pressure (IOP) control is very important in these patients. Read More

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Long-term variations in solar radiation, diffuse radiation, and diffuse radiation fraction caused by aerosols in China during 1961-2016.

PLoS One 2021 3;16(5):e0250376. Epub 2021 May 3.

State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China.

The effects of atmospheric aerosols on the terrestrial climate system are more regional than those of greenhouse gases, which are more global. Thus, it is necessary to examine the typical regional effects of how aerosols affect solar radiation in order to develop a more comprehensive understanding. In this study, we used global AErosol RObotic NETwork (AERONET) data and robust radiation observational evidence to investigate the impact of aerosols on total radiation, diffuse radiation, and the diffuse radiation fraction in China from 1961 to 2016. Read More

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The Association Between Ambient PM Exposure and Anemia Outcomes Among Children Under Five Years of Age in India.

Environ Epidemiol 2021 Feb 7;5(1):e125. Epub 2021 Jan 7.

St. John's Medical College, Bengaluru, India.

Anemia is highly prevalent in India, especially in children. Exposure to ambient fine particulate matter (PM) is a potential risk factor for anemia via. systemic inflammation. Read More

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February 2021

Characterization of the aerosol chemical composition during the COVID-19 lockdown period in Suzhou in the Yangtze River Delta, China.

J Environ Sci (China) 2021 Apr 22;102:110-122. Epub 2020 Sep 22.

Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science &Technology, Nanjing 210044, China.

To control the spread of COVID-19, rigorous restrictions have been implemented in China, resulting in a great reduction in pollutant emissions. In this study, we evaluated the air quality in the Yangtze River Delta during the COVID-19 lockdown period using satellite and ground-based data, including particle matter (PM), trace gases, water-soluble ions (WSIs) and black carbon (BC). We found that the impacts of lockdown policy on air quality cannot be accurately assessed using MODIS aerosol optical depth (AOD) data, whereas the tropospheric nitrogen dioxide (NO) vertical column density can well reflect the influences of these restrictions on human activities. Read More

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The influence of aerosols on the NO photolysis rate in a suburban site in North China.

Sci Total Environ 2021 May 27;767:144788. Epub 2021 Jan 27.

State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; University of the Chinese Academy of Sciences, Beijing 100049, China; Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Science, Xiamen 361021, China.

The photolysis of NO is an important driving force of tropospheric ozone. The intensity of this photolysis reaction affects atmospheric oxidation and photochemical pollution process. Photolysis rate of nitrogen dioxide (JNO) is affected by aerosols, temperature, solar zenith angle (SZA), clouds, and so on. Read More

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Urmia Lake dust storms occurrences: investigating the relationships with changes in water zone and land cover in the eastern part using remote sensing and GIS.

Environ Monit Assess 2021 Jan 19;193(2):70. Epub 2021 Jan 19.

Department of Environment, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran.

Urmia Lake is the largest lake in the Middle East which has greatly decreased in recent years. It has had a great impact on the environmental properties of areas around the lake. This study aimed to identify the relationship among dust storms in the eastern part of Urmia Lake and the surrounding vegetation due to the annual and long-term variability of this water zone during the statistical period 1999-2019. Read More

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January 2021

Role of emissions and meteorology in the recent PM changes in China and South Korea from 2015 to 2018.

Environ Pollut 2021 Feb 8;270:116233. Epub 2020 Dec 8.

Department of Environmental and Safety Engineering, Ajou University, Suwon, South Korea. Electronic address:

In this study, we examined the change rates of PM concentrations, aerosol optical depth (AOD), and the concentrations of PM precursors, such as SO and NO, in China and South Korea using surface and satellite observations from 2015 to 2018. To quantify the impacts of the emissions and meteorology on the concentration changes, we performed a series of air quality simulations with year-specific meteorology and a fixed anthropogenic emissions inventory. The surface PM observations in China and South Korea decreased at rates of 9. Read More

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February 2021

Impact of the COVID-19 outbreak on air pollution levels in East Asia.

Sci Total Environ 2021 Feb 7;754:142226. Epub 2020 Sep 7.

Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77004, USA. Electronic address:

This study leverages satellite remote sensing to investigate the impact of the coronavirus outbreak and the resulting lockdown of public venues on air pollution levels in East Asia. We analyze data from the Sentinel-5P and the Himawari-8 satellites to examine concentrations of NO, HCHO, SO, and CO, and the aerosol optical depth (AOD) over the BTH, Wuhan, Seoul, and Tokyo regions in February 2019 and February 2020. Results show that most of the concentrations of pollutants are lower than those of February 2019. Read More

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February 2021

[Aerosol Optical Properties over the Ebinur Region].

Huan Jing Ke Xue 2020 Aug;41(8):3484-3491

Key Laboratory of Smart City and Environment Modelling of Higher Education Institute, College of Resources and Environment Science, Xinjiang University, Urumqi 830046, China.

The key to understanding the transport and deposition process of salt dust to Ebinur Lake involves the quantitative evaluation of the aerosol concentration and characteristics in Jinghe County. Based on the data of the CE-318 sun photometer station in Jinghe County during 2019, the characteristics of the aerosol optical depth (AOD) and Angström exponent () were analysed. The results showed that the daily variation of the AOD in Jinghe County was a single peak curve that increased or decreased monotonously in the early/late peak period and peaked at 12:00-14:00, which was opposite to the trend of the . Read More

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[Spatio-temporal Evolution of PM Concentration During 2000-2019 in China].

Huan Jing Ke Xue 2020 Nov;41(11):4832-4843

College of Geography and Tourism, Anhui Normal University, Wuhu 241002, China.

An ensemble estimation model of PM concentration was proposed on the basis of extreme gradient boosting, gradient boosting, random forest model, and stacking model fusion technology. Measured PM data, MERRA-2 AOD and PM reanalysis data, meteorological parameters, and night light data sets were used. On this basis, the spatiotemporal evolution features of PM concentration in China during 2000-2019 were analyzed at monthly, seasonal, and annual temporal scales. Read More

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November 2020

Spatial and temporal variations of air pollution over 41 cities of India during the COVID-19 lockdown period.

Sci Rep 2020 10 6;10(1):16574. Epub 2020 Oct 6.

University of Maryland, College Park, MD, USA.

In this study, we characterize the impacts of COVID-19 on air pollution using NO and Aerosol Optical Depth (AOD) from TROPOMI and MODIS satellite datasets for 41 cities in India. Specifically, our results suggested a 13% NO reduction during the lockdown (March 25-May 3rd, 2020) compared to the pre-lockdown (January 1st-March 24th, 2020) period. Also, a 19% reduction in NO was observed during the 2020-lockdown as compared to the same period during 2019. Read More

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October 2020

[Effects of hypothermia on the repolarization duration of ventricular myocytes in rats and its mechanism].

Zhongguo Ying Yong Sheng Li Xue Za Zhi 2020 May;36(3):228-231

School of Anesthesiology, Guizhou Medical University, Guiyang 550001.

To observe the effects of hypothermia on the repolarization duration and the expression of Kir2.1 protein of ventricular myocytes in isolated rat heart and explore the role of Kir2.1 protein. Read More

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Importance of meteorology in air pollution events during the city lockdown for COVID-19 in Hubei Province, Central China.

Sci Total Environ 2021 Feb 4;754:142227. Epub 2020 Sep 4.

Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of the China Meteorological Administration, PREMIC, Nanjing University of Information Science &Technology, Nanjing 210044, China.

Compared with the 21-year climatological mean over the same period during 2000-2020, the aerosol optical depth (AOD) and Angstrom exponent (AE) during the COVID-19 lockdown (January 24-February 29, 2020) decreased and increased, respectively, in most regions of Central-Eastern China (CEC). The AOD (AE) values decreased (increased) by 39.2% (29. Read More

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February 2021

Temporary reduction in fine particulate matter due to 'anthropogenic emissions switch-off' during COVID-19 lockdown in Indian cities.

Sustain Cities Soc 2020 Nov 13;62:102382. Epub 2020 Jul 13.

Global Centre for Clean Air Research (GCARE), Department of Civil and Environmental Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom.

The COVID-19 pandemic elicited a global response to limit associated mortality, with social distancing and lockdowns being imposed. In India, human activities were restricted from late March 2020. This 'anthropogenic emissions switch-off' presented an opportunity to investigate impacts of COVID-19 mitigation measures on ambient air quality in five Indian cities (Chennai, Delhi, Hyderabad, Kolkata, and Mumbai), using in-situ measurements from 2015 to 2020. Read More

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November 2020

Effect of lockdown due to SARS COVID-19 on aerosol optical depth (AOD) over urban and mining regions in India.

Sci Total Environ 2020 Nov 19;745:141024. Epub 2020 Jul 19.

Department of Mining Engineering, National Institute of Technology (NIT), Rourkela 769008, India. Electronic address:

The Severe Acute Respiratory Syndrome-COronaVIrus Diseases 2019 (SARS-COVID-19) pandemic has posed a serious threat to human health (death) and substantial economic losses across the globe. It was however presumed that extreme preventive measures of entire lockdown in India might have reduced the air pollution level and therefore decreased the aerosol optical depth (AOD). The Moderate Resolution Imaging Spectroradiometer (MODIS)-based Multi-angle Implementation of Atmospheric Correction (MAIAC) daily AOD product was deployed to investigate the change in AOD level during lockdown phases across the Indian Territory as compared to the long-term mean AOD level (2000-2019) of the same periods. Read More

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November 2020

Effect of Angle Narrowing on Sectoral Variation of Anterior Chamber Angle Width: The Chinese American Eye Study.

Ophthalmol Glaucoma 2020 Mar-Apr;3(2):130-138. Epub 2019 Dec 27.

Southern California Eye Institute, CHA Hollywood Presbyterian Medical Center, Los Angeles, California.

Purpose: To characterize the relationship between mean and sectoral variation of anterior chamber angle (ACA) width using anterior segment optical coherence tomography (AS-OCT).

Methods: Subjects aged 50 years or older were identified from the Chinese American Eye Study (CHES), a population-based epidemiological study in Los Angeles, CA. Each subject underwent a complete ocular examination including gonioscopy and AS-OCT imaging. Read More

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[PM Concentration Influencing Factors in China Based on the Random Forest Model].

Huan Jing Ke Xue 2020 May;41(5):2057-2065

College of Geography and Tourism, Anhui Normal University, Wuhu 241002, China.

In this paper, aerosol optical depth (AOD), elevation (DEM), annual precipitation (PRE), annual average temperature (TEM), annual average wind speed (WS), population density (POP), gross domestic product density (GDP), and normalized difference vegetation index (NDVI) were selected as factors influencing PM concentration. The random forest model, order of feature importance, and partial dependency plots were applied to investigate these factors and their regional differences in PM spatial pattern. The results showed that:① The random forest model was more accurate than multiple regression, generalized additive, and back propagation neural network models in estimating PM concentration, which can be applied to quantifying PM influencing factors. Read More

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[Spatial and Temporal Characteristics of AOD and Angström Exponent in the Yangtze River Delta Based on MODIS_C061].

Huan Jing Ke Xue 2020 Jun;41(6):2617-2624

College of Geoscience and Surveying Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China.

Considering the Yangtze River Delta as the research region, the applicability of the Terra-MODIS C061 deep blue algorithm (DB) AOD products was evaluated using Aerosol Robotic Network (AERONET) ground-based observations. The results demonstrated that the correlation between Terra-MODIS C061 deep blue algorithm (DB) aerosol optical depth (AOD) and AERONET AOD was high (0.95). Read More

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[Spatio-Temporal Distribution and Variation Characteristics of Aerosol Optical Properties in Henan Province].

Huan Jing Ke Xue 2020 Feb;41(2):600-608

Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China.

The temporal variation and spatial distribution characteristics of aerosol optical depth (AOD), aerosol column mass concentration (AMC), and fine mode fraction (FMF) were analyzed based on the aerosol product information obtained from MODIS/Terra C6.1 from 2001 to 2018 in the Henan province. The spatial distribution of AOD and AMC in all seasons are high in the east and low in the west, and high in the north and low in the south, which was related to the special topography, population distribution, and number of enterprises in each region. Read More

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February 2020