Article
Geosciences, Multidisciplinary
Abinaya Sekar, R. S. Jasna, B. V. Binoy, Prem Mohan, George Kuttiparichel Varghese
Summary: This study analyzed the change in air quality and public perception following the COVID-19 lockdown in India. The results showed an average improvement of approximately 40% in the air quality index, with significant reductions in PM10, PM2.5, NO2, and SO2 levels. The study also found a correlation between PM10, PM2.5, and ozone, indicating the presence of secondary particulates in the atmosphere. The survey revealed that 60% of respondents perceived an improvement in air quality, with household emissions identified as a significant source of pollution.
Article
Environmental Sciences
Bhishma Tyagi, Naresh Krishna Vissa, Sachin D. Ghude
Summary: The COVID-19 pandemic led to lockdown measures in many countries, resulting in reduced pollution. However, as the lockdowns are lifted, pollution is returning to normal levels. A study focused on the unlock phases in India shows significant differences in pollutant variations compared to climatological variations, and predicts future emissions.
Article
Environmental Sciences
Zhiyuan Hu, Qinjian Jin, Yuanyuan Ma, Zhenming Ji, Xian Zhu, Wenjie Dong
Summary: This study examines the impact of the COVID-19 pandemic and the National Clean Air Programme (NCAP) on air quality in the Indian subcontinent. The results show significant improvements in air quality during the lockdown period in 2020, while no persistent improvement is observed during the NCAP period. The study also identifies the role of relative humidity and the planetary boundary layer in influencing air quality during the lockdown.
Article
Geosciences, Multidisciplinary
Qili Dai, Linlu Hou, Bowen Liu, Yufen Zhang, Congbo Song, Zongbo Shi, Philip K. Hopke, Yinchang Feng
Summary: The 2020 COVID-19 outbreak in China led to an unprecedented lockdown, resulting in a reduction in air pollutant emissions. Machine learning was used to analyze the effects of meteorology on air quality in 31 major Chinese cities, revealing changes in NO2, O-3, and PM2.5 concentrations. It was found that the lockdown measures had a smaller impact on air quality compared to the effects of weather and Spring Festival celebrations.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Green & Sustainable Science & Technology
Swades Pal, Priyanka Das, Indrajit Mandal, Rajesh Sarda, Susanta Mahato, Kim-Anh Nguyen, Yuei-An Liou, Swapan Talukdar, Sandipta Debanshi, Tamal Kanti Saha
Summary: The highly urbanized and industrialized Asansol Durgapur industrial belt in Eastern India experienced positive impacts on air quality and land surface temperature as a result of lockdown measures taken due to the COVID-19 pandemic. During the lockdown period, there was a reduction in land surface temperature, PM10 levels, and anthropogenic heat flux. The air quality index also upgraded from poor to very poor state to moderate to satisfactory state.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Saidur Rahaman, Selim Jahangir, Ruishan Chen, Pankaj Kumar, Swati Thakur
Summary: The study assesses the air quality in 15 major cities of India during COVID-19 lockdown, showing a decrease in concentrations of PM2.5, NO2, CO, and SO2, and an increase in O-3. The data demonstrates the significant impact of anthropogenic activities restrictions on primary atmospheric pollutants emissions, leading to improved air quality.
Article
Environmental Sciences
Jay Dave, Rohit Meena, Atinderpal Singh, Neeraj Rastogi
Summary: This study found that reduced anthropogenic emissions during the lockdown period had a significant impact on the concentration of non-refractory particulate matter and black carbon in the atmosphere of Ahmedabad, with similar diurnal trends observed during lockdown and non-lockdown periods. Source apportionment analysis of organic aerosols revealed three main factors contributing to the total organic aerosol levels.
Article
Multidisciplinary Sciences
Venkat Ratnam Madineni, Hari Prasad Dasari, Ramakrishna Karumuri, Yesubabu Viswanadhapalli, Prasad Perumal, Ibrahim Hoteit
Summary: Lockdown measures during the COVID-19 pandemic in India led to a significant reduction in aerosols and trace gases over Northwest India, the Indo Gangetic Plain, and the Northeast Indian regions, mainly due to an increase in the boundary layer height and reduced emissions. However, Central and South India experienced an increase in pollutant levels, attributed to long-range transport of aerosols and decreased wind speed causing stagnation. The study highlights the importance of both emissions and natural processes in influencing pollution concentrations over the Indian sub-continent.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Susanta Mahato, Swades Pal
Summary: The impact of nationwide lockdown and city-scale restriction on air quality in Delhi, India was studied. The study found that both types of lockdown improved air quality, but the improvement was higher during the nationwide lockdown compared to the city-scale lockdown. Disparity in air quality was observed between the core and periphery areas during the city-scale lockdown.
Article
Geography
Rahul Kashyap, J. Kuttippurath, V. K. Patel
Summary: The study reveals that the lockdown measures in India due to the pandemic have significantly improved air quality, leading to enhanced vegetation growth and photosynthetic activity, particularly in croplands. This study is of great importance in addressing the challenges of food security caused by climate pollution and combating global warming through increased greening.
Article
Environmental Sciences
Xinlin Yan, Tao Sun
Summary: This study examines the changes in air quality indexes and their influencing factors in 40 major cities in China from 2017 to 2021. It finds that the lockdown policy implemented in 2020 led to a decrease in AQI, PM2.5, and PM10 values, with an increase in the number of days where AQI level was below 100. The concentration of air pollutants shows significant regional characteristics due to varying degrees of industrialization. The study also identifies carbon emission intensity, per capita energy consumption, per capita GDP, industrialization rate, and proportion of construction value added as the factors with the greatest impact on AQI.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Multidisciplinary Sciences
Manjeet, Anurag Airon, Rahul Kumar, Ruksar Saifi
Summary: This paper presents the evaluation of air quality in different districts of Haryana using geo-spatial techniques to estimate the spatial and temporal variation of gaseous and particulate pollutants. The results show an improvement in air quality from poor to satisfactory in 2019 and further improvement to good in 2020, primarily due to the COVID-19 lockdown.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Xiaoxiao Feng, Xiaole Zhang, Cenlin He, Jing Wang
Summary: The study confirmed the significant improvement in air quality in Wuhan due to the lockdown, with the closure of the industrial sector having a more significant impact on reducing pollutants.
Article
Environmental Sciences
Baisakhi Chakraborty, Sambhunath Roy, Amit Bera, Partha Pratim Adhikary, Biswajit Bera, Debashish Sengupta, Gouri Sankar Bhunia, Pravat Kumar Shit
Summary: The sudden lockdown has had a significant impact on the water quality of the Damodar River, with noticeable differences in water quality indicators between the lockdown and pre-lockdown periods. Nutrient supplies in the river have decreased during the lockdown, leading to improvements in the eutrophic condition of certain stretches.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Calvin Jephcote, Anna L. Hansell, Kathryn Adams, John Gulliver
Summary: The UK implemented a lockdown in Spring 2020 to reduce person-to-person transmission of SARS-CoV-2 virus. The study found a 69% reduction in traffic during the lockdown period, leading to decreases in NO2 and PM2.5 pollutants while O-3 concentrations increased. Results suggest that sustained improvements in air quality require actions across various sectors.
ENVIRONMENTAL POLLUTION
(2021)
Article
Geosciences, Multidisciplinary
Poornima Dhawaskar, Sohini Ganguly, Ranadhir Mukhopadhyay, C. Manikyamba, Sridhar D. Iyer, Siddaiah Metikurke Karisiddaiah, Kotha Mahender
GEOLOGICAL JOURNAL
(2020)
Article
Geosciences, Multidisciplinary
R. Prerna, Kotha Mahender
GEO-MARINE LETTERS
(2020)
Article
Geography, Physical
Pankaj Prasad, Victor Joseph Loveson, Mahender Kotha, Ramanand Yadav
GISCIENCE & REMOTE SENSING
(2020)
Article
Oceanography
Alvarinho J. Luis, Kiledar S. Tomar, Ashutosh Prasad
Summary: This study investigates the hydrodynamics in the southwestern Indian Ocean sector of the Southern Ocean using XCTD observations and satellite data. It reveals the movement patterns and temperature-salinity distribution characteristics of the Polar Front, Antarctic Circumpolar Current Front, and the Southern Boundary of the ACC.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Environmental Sciences
Kiledar Singh Tomar, Sheetal Kumari, Alvarinho J. Luis
Summary: This study investigated the ice flow dynamics of the Polar Record Glacier from December to April between 2016 and 2019 using remote sensing techniques. The results showed fluctuating ice flow velocities, with higher speeds near the glacier terminus and lower values towards the ice sheet portion. The study also observed changes in the glacier's front position and total area, attributing the increased speed in early winter to ice-free water surrounding the glacier terminus.
GEOCARTO INTERNATIONAL
(2022)
Article
Environmental Sciences
Pankaj Prasad, Victor Joseph Loveson, Bappa Das, Mahender Kotha
Summary: The research proposes new ensemble models for flood susceptibility mapping by combining machine learning techniques in a vulnerable area of India. Comparison of individual and ensemble models suggests that AB-RF has the highest prediction efficiency.
GEOCARTO INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Virsen Gaikwad, Firoz Badesab, Pawan Dewangan, Mahender Kotha
Summary: The study investigated the complex magnetic mineral assemblages and zonation in sediment cores from cold seep sites in the Bay of Bengal, providing insights into the controls of structural and diagenetic processes on sediment magnetism. The high-resolution seismic data revealed distinct sediment magnetic zones and variations in rock magnetic properties, highlighting the formation and evolution of magnetic minerals in response to diagenetic dissolution and precipitation processes.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geochemistry & Geophysics
A. Hazra, A. Saha, A. Verencar, M. Satyanarayanan, S. Ganguly, M. Kotha
Summary: Reactive percolation of enriched asthenospheric melts and widespread melt-rock interactions are the key factors contributing to mantle refertilization and compositional heterogeneity at mid oceanic ridge-rift systems. The mineralogical and geochemical data of abyssal peridotites from the Central Indian Ridge provide evidence of enriched intraoceanic forearc mantle affinity and refertilization by boninitic melt percolation, suggesting a tectonic transition towards an embryonic suprasubduction zone for the region. The chemical signatures of these rocks indicate replenishment of depleted sub-ridge upper mantle by subduction-derived boninitic melts and initiation of spontaneous intraoceanic subduction along submarine transform faults and fracture zones of the slow-spreading Central Indian Ridge.
Article
Ecology
Alvarinho J. Luis, Vinit R. Lotlikar
Summary: Through data analysis and comparison, the study identified the specific locations of the Agulhas Current and Retroflection, observed the vertical temperature and salinity profiles in the Agulhas region, and studied the flow transport characteristics, as well as the presence of the southern anticyclonic eddy. It also revealed patterns of winter water distribution in certain areas, which had implications for marine ecology.
Article
Environmental Sciences
Ritwik Nigam, Alvarinho J. Luis, Pankaj Prasad, Sachit Kuttikar, Ramanand Yadav, Eric Vaz, Mahender Kotha
Summary: This study examined the status of beach litter at famous beaches in Goa, West India, and the impact of the Covid-19 lockdown. The results showed an increase in glass litter and a decrease in plastic litter during the lockdown compared to the high tourist inflow during the unlock period. The beaches were classified and graded based on litter density, with most beaches showing clean maintenance during both the lockdown and unlock periods.
MARINE POLLUTION BULLETIN
(2022)
Article
Environmental Sciences
Shridhar D. Jawak, Sagar F. Wankhede, Alvarinho J. Luis, Keshava Balakrishna
Summary: Glacier surface facies are valuable indicators of changes in a glacial system, with remote sensing observations becoming crucial in the absence of continuous field monitoring. The study found that FLAASH was the more reliable and recommended atmospheric correction algorithm, while MXL may provide reliable thematic classification.
Article
Multidisciplinary Sciences
Ritwik Nigam, Gaurav Tripathi, Tannu Priya, Alvarinho J. Luis, Eric Vaz, Shashikant Kumar, Achala Shakya, Bruno Damasio, Mahender Kotha
Summary: This study quantifies the impact of COVID-19 lockdowns on environmental parameters in five alpha cities and finds significant variations in the effects. Total lockdowns were more effective in revitalizing the urban environment, while partial lockdowns had limited effects due to restrictions on transportation and shopping activities.