Environmental Science, Renewable Energy, Sustainability and the Environment, Environmental Engineering, Pollution
15
Scopus Publications
714
Scholar Citations
10
Scholar h-index
10
Scholar i10-index
Scopus Publications
Assessment of different types of bricks in varying wall configurations in an indoor thermal environment for a semi-arid region Hardik H. Gajjar, Jai Devi Jeyaraman Architectural Science Review, 2024 This study evaluates the indoor thermal benefits of seven bricks, and their combination with cavity walls, Vertical Greening Systems (VGS), and Expanded Polystyrene (EPS) insulation in a semi-arid Indian climate using EnergyPlus simulations. For walls with VGS and exterior EPS with higher heat capacity, peak summer Operative temperatures (Top) reduced up to 2.3°C, followed by cavity walls and EPS on middle of the wall (up to 1.3°C) compared to their respective bare walls. Interior EPS raised Top by up to 0.7°C. VGS and EPS minimized heat flux fluctuations due to their lower Decrement Factor. VGS exhibited superior indoor thermal comfort, with more occupants satisfied for longer durations compared to exterior EPS. This study suggests that applying VGS or EPS on the exterior (regardless of brick type) is more effective in enhancing indoor thermal comfort during hot days in semi-arid regions .
Assessment of Role of Water Body on Thermal Comfort in Ahmedabad, India Hardik Gajjar, J Jai Devi Iop Conference Series Earth and Environmental Science, 2019 Increasing urbanization at rapid pace is definitely reducing the green cover and ultimately increases the urban temperature. The side cause of this elevated temperature at city centre compared to the suburbs and rural areas (Urban Heat Island) is enhancement of human thermal discomfort at the outdoor spaces and may even cause death due to heat stroke. This factor becomes a key role for urban planners and designers to create safe and pleasant spaces to live, work and commute. Several research works has been done to assess the role of green cover in reducing the UHI intensity and improve the thermal comfort, but less shade has been given on the cooling potential of urban water bodies. This work tries to investigate the effectiveness of Kankaria lake (Ahmedabad, India) that may have in cooling its nearby places (<500 m) and also on assessing outdoor thermal comfort using an index PET. Simultaneous ground measurement were taken around Kankaria lake at 4 selected locations on 10 minute interval starting from 14:00 to 16:30 in month of October for 7 days. Microclimatic parameters like air temperature, wind velocity, relative humidity, globe temperature and mean radiant temperature were measured using hand-held devices. Results indicate that the western side of Kankaria Lake observed drop in 0.2°C compared to the eastern side. Whereas, PET showed drop in maximum of 1.44°C on the western side, but it was still under the stress condition as per PET scale for sub-tropical climate zone.
Development of a Low Cost Miniature Device for High Spatial, Distributed Monitoring of Aerosol Optical Depth for Regional Level Microclimatic Studies D. S. Kaul, H. Gajjar, J. Jai Devi, A. Kandya Iop Conference Series Earth and Environmental Science, 2019 Air pollution becomes severe when air contains small particles, toxic gases, dust and smoke emitted from numerous sources such as vehicles, industries, fires or fumes in harmful amount. Aerosols of highly reflective in nature increases albedo of the earth and thereby cools the surface and thus effectively offsets greenhouse gases warming by about 25-50%; whereas, absorbing type of aerosols absorbs solar radiation hence increases the surface temperature. Absorbing type aerosols are largely present in the urban environment due to presence of relatively larger number of vehicular fleet and subsequent more fossil fuel combustion than in rural area. Excessive inhalation of particulate matter is detrimental to human health as it can lead to asthma, lung cancer and cardiovascular diseases. Thus, it becomes essential to monitor aerosols accurately using affordable device having widespread presence and potential to address the related problematic issues. One of the important parameters in aerosol measurement is aerosol optical depth (AOD). Several instruments and techniques are used to measure AOD such as with satellite and ground based sun-photometry, ground and airborne radiometers and LIDARs which are generally costly and non-portable. Hence, an effort has been made to develop an affordable sun photometer using photo-detectors and light filters which will track the sun automatically and retrieve AOD of that location. Device measurement thus built has been correlated with standard instrument measurement like Microtops Sunphotometer
The discoloration of the taj mahal: Source apportionment, source impacts & human health outcomes in Agra International Conference on Atmospheric Optics Aerosols Visibility and the Radiative Balance, 2016
Brown carbon aerosol in the North American continental troposphere: Sources, abundance, and radiative forcing J. Liu, E. Scheuer, J. Dibb, G. S. Diskin, L. D. Ziemba, K. L. Thornhill, B. E. Anderson, A. Wisthaler, T. Mikoviny, J. J. Devi, M. Bergin, A. E. Perring, M. Z. Markovic, J. P. Schwarz, P. Campuzano-Jost, D. A. Day, J. L. Jimenez, R. J. Weber Atmospheric Chemistry and Physics, 2015 Chemical components of organic aerosol (OA) selectively absorb light at short wavelengths. In this study, the prevalence, sources, and optical importance of this so-called brown carbon (BrC) aerosol component are investigated throughout the North American continental tropospheric column during a summer of extensive biomass burning. Spectrophotometric absorption measurements on extracts of bulk aerosol samples collected from an aircraft over the central USA were analyzed to directly quantify BrC abundance. BrC was found to be prevalent throughout the 1 to 12 km altitude measurement range, with dramatic enhancements in biomass-burning plumes. BrC to black carbon (BC) ratios, under background tropospheric conditions, increased with altitude, consistent with a corresponding increase in the absorption Ångström exponent (AAE) determined from a three-wavelength particle soot absorption photometer (PSAP). The sum of inferred BC absorption and measured BrC absorption at 365 nm was within 3 % of the measured PSAP absorption for background conditions and 22 % for biomass burning. A radiative transfer model showed that BrC absorption reduced top-of-atmosphere (TOA) aerosol forcing by ~ 20 % in the background troposphere. Extensive radiative model simulations applying this study background tropospheric conditions provided a look-up chart for determining radiative forcing efficiencies of BrC as a function of a surface-measured BrC : BC ratio and single scattering albedo (SSA). The chart is a first attempt to provide a tool for better assessment of brown carbon's forcing effect when one is limited to only surface data. These results indicate that BrC is an important contributor to direct aerosol radiative forcing.
The discoloration of the Taj Mahal due to particulate carbon and dust deposition M. H. Bergin, S. N. Tripathi, J. Jai Devi, T. Gupta, M. Mckenzie, K. S. Rana, M. M. Shafer, Ana M. Villalobos, J. J. Schauer Environmental Science and Technology, 2015 The white marble domes of the Taj Mahal are iconic images of India that attract millions of visitors every year. Over the past several decades the outer marble surfaces of the Taj Mahal have begun to discolor with time and must be painstakingly cleaned every several years. Although it has been generally believed that the discoloration is in some way linked with poor air quality in the Agra region, the specific components of air pollution responsible have yet to be identified. With this in mind, ambient particulate matter (PM) samples were collected over a one-year period and found to contain relatively high concentrations of light absorbing particles that could potentially discolor the Taj Mahal marble surfaces, that include black carbon (BC), light absorbing organic carbon (brown carbon, BrC), and dust. Analyses of particles deposited to marble surrogate surfaces at the Taj Mahal indicate that a large fraction of the outer Taj Mahal surfaces are covered with particles that contain both carbonaceous components and dust. We have developed a novel approach that estimates the impact of these deposited particles on the visible light surface reflectance, which is in turn used to estimate the perceived color by the human eye. Results indicate that deposited light absorbing dust and carbonaceous particles (both BC and BrC from the combustion of fossil fuels and biomass) are responsible for the surface discoloration of the Taj Mahal. Overall, the results suggest that the deposition of light absorbing particulate matter in regions of high aerosol loading are not only influencing cultural heritage but also the aesthetics of both natural and urban surfaces.
Brown carbon in the continental troposphere Jiumeng Liu, Eric Scheuer, Jack Dibb, Luke D. Ziemba, Kenneth. L. Thornhill, Bruce E. Anderson, Armin Wisthaler, Tomas Mikoviny, J Jai Devi, Michael Bergin, Rodney J. Weber Geophysical Research Letters, 2014
Outdoor thermal sensation scale through biometeorological assessment for semi-arid climate HH Gajjar, D Upadhyay, M Hussain, JD Jeyaraman International Journal of Biometeorology 69 (11), 2871-2881 , 2025 2025 Citations: 2
Effects of Interior and Exterior Shading Elements on the Indoor Thermal Environment for Buildings in a Semiarid Climate HH Gajjar, H Motiyani, Q Sameed, JD Jeyaraman Journal of Architectural Engineering 31 (1), 04024040 , 2025 2025
Assessment of different types of bricks in varying wall configurations in an indoor thermal environment for a semi-arid region HH Gajjar, JD Jeyaraman Architectural Science Review 67 (2), 173-188 , 2024 2024 Citations: 1
Role of Azadirachta indica (Neem) and Polyalthia longifolia (Asopalav) trees for improving outdoor thermal environment in unorganized urban settings HH Gajjar, JD Jeyaraman, DS Kaul International Journal of Biometeorology 66 (10), 2055-2067 , 2022 2022 Citations: 7
Understanding the sources of heavy metal pollution in ambient air of neighboring a solid waste landfill site UH Mehta, DS Kaul, D Westerdahl, Z Ning, K Zhang, L Sun, P Wei, ... Aerosol Science and Engineering 6 (2), 161-175 , 2022 2022 Citations: 11
Photo-active catalysts in building and construction materials for air pollution treatment: A bibliometric analysis A Nema, DS Kaul, K Mukherjee, JD Jeyaraman Materials Today: Proceedings 62, 7297-7301 , 2022 2022 Citations: 5
Assessment of role of water body on thermal comfort in ahmedabad, India H Gajjar, J Jai Devi IOP Conference Series: Earth and Environmental Science 281 (1), 012023 , 2019 2019 Citations: 9
Development of a Low Cost Miniature Device for High Spatial, Distributed Monitoring of Aerosol Optical Depth for Regional Level Microclimatic Studies DS Kaul, H Gajjar, J Jai Devi, A Kandya IOP Conference Series: Earth and Environmental Science 281 (1), 012006 , 2019 2019
Effect of Different Land Use Generated Polluting Sources on Columnar Atmospheric Aerosol DS Kaul, H Gajjar, J Jeyaraman, AS Kandya AGU Fall Meeting Abstracts 2018, A21G-2722 , 2018 2018
Contribution of particulate brown carbon to light absorption in the rural and urban Southeast US JJ Devi, MH Bergin, M Mckenzie, JJ Schauer, RJ Weber Atmospheric Environment 136, 95-104 , 2016 2016 Citations: 41
The discoloration of the taj mahal: Source apportionment, source impacts & human health outcomes in Agra A Nagpure, L Luo, A Ramaswami, M Bergin, A Russell, S Tripathi, ... International Conference on Atmospheric Optics: Aerosols, Visibility, and … , 2016 2016
Brown carbon aerosol in the North American continental troposphere: sources, abundance, and radiative forcing J Liu, E Scheuer, J Dibb, GS Diskin, LD Ziemba, KL Thornhill, ... Atmospheric Chemistry and Physics 15 (14), 7841-7858 , 2015 2015 Citations: 137
Source apportionment of carbonaceous fine particulate matter (PM2. 5) in two contrasting cities across the Indo–Gangetic Plain AM Villalobos, MO Amonov, MM Shafer, JJ Devi, T Gupta, SN Tripathi, ... Atmospheric Pollution Research 6 (3), 398-405 , 2015 2015 Citations: 97
The discoloration of the Taj Mahal due to particulate carbon and dust deposition MH Bergin, SN Tripathi, J Jai Devi, T Gupta, M McKenzie, KS Rana, ... Environmental science & technology 49 (2), 808-812 , 2015 2015 Citations: 77
Brown carbon in the continental troposphere J Liu, E Scheuer, J Dibb, LD Ziemba, KL Thornhill, BE Anderson, ... Geophysical Research Letters 41 (6), 2191-2195 , 2014 2014 Citations: 168
CCN closure results from Indian Continental Tropical Convergence Zone (CTCZ) aircraft experiment M Srivastava, SN Tripathi, AK Dwivedi, R Dalai, D Bhattu, PK Bharti, ... Atmospheric research 132, 322-331 , 2013 2013 Citations: 25
Measurement of personal and integrated exposure to particulate matter and co-pollutant gases: A panel study JJ Devi, T Gupta, R Jat, SN Tripathi Environmental Science and Pollution Research 20 (3), 1632-1648 , 2013 2013 Citations: 20
Probable linkage between aerosol and cloud in Successive Contrasting Monsoons (2008 and 2009) J Jai Devi, SN Tripathi, S Dey, M Michael, T Gupta Ann. Geophys., submitted , 2013 2013 Citations: 2
Strong Absorption Associated with Coarse Mode Particles over CTCZ Region: Results from Aircraft Experiment 2009 JJ Devi, P Choudhry, M Michael, SN Tripathi, T Gupta 第七届亚洲气溶胶会议论文集 , 2011 2011
Observation-based 3-D view of aerosol radiative properties over Indian Continental Tropical Convergence Zone: implications to regional climate JJ Devi, SN Tripathi, T Gupta, BN Singh, V Gopalakrishnan, S Dey Tellus B: Chemical and Physical Meteorology 63 (5), 971-989 , 2011 2011 Citations: 53
MOST CITED SCHOLAR PUBLICATIONS
Brown carbon in the continental troposphere J Liu, E Scheuer, J Dibb, LD Ziemba, KL Thornhill, BE Anderson, ... Geophysical Research Letters 41 (6), 2191-2195 , 2014 2014 Citations: 168
Brown carbon aerosol in the North American continental troposphere: sources, abundance, and radiative forcing J Liu, E Scheuer, J Dibb, GS Diskin, LD Ziemba, KL Thornhill, ... Atmospheric Chemistry and Physics 15 (14), 7841-7858 , 2015 2015 Citations: 137
Source apportionment of carbonaceous fine particulate matter (PM2. 5) in two contrasting cities across the Indo–Gangetic Plain AM Villalobos, MO Amonov, MM Shafer, JJ Devi, T Gupta, SN Tripathi, ... Atmospheric Pollution Research 6 (3), 398-405 , 2015 2015 Citations: 97
The discoloration of the Taj Mahal due to particulate carbon and dust deposition MH Bergin, SN Tripathi, J Jai Devi, T Gupta, M McKenzie, KS Rana, ... Environmental science & technology 49 (2), 808-812 , 2015 2015 Citations: 77
Assessment of personal exposure to inhalable indoor and outdoor particulate matter for student residents of an academic campus (IIT-Kanpur) J Jai Devi, T Gupta, SN Tripathi, KK Ujinwal Inhalation Toxicology 21 (14), 1208-1222 , 2009 2009 Citations: 59
Observation-based 3-D view of aerosol radiative properties over Indian Continental Tropical Convergence Zone: implications to regional climate JJ Devi, SN Tripathi, T Gupta, BN Singh, V Gopalakrishnan, S Dey Tellus B: Chemical and Physical Meteorology 63 (5), 971-989 , 2011 2011 Citations: 53
Contribution of particulate brown carbon to light absorption in the rural and urban Southeast US JJ Devi, MH Bergin, M Mckenzie, JJ Schauer, RJ Weber Atmospheric Environment 136, 95-104 , 2016 2016 Citations: 41
CCN closure results from Indian Continental Tropical Convergence Zone (CTCZ) aircraft experiment M Srivastava, SN Tripathi, AK Dwivedi, R Dalai, D Bhattu, PK Bharti, ... Atmospheric research 132, 322-331 , 2013 2013 Citations: 25
Measurement of personal and integrated exposure to particulate matter and co-pollutant gases: A panel study JJ Devi, T Gupta, R Jat, SN Tripathi Environmental Science and Pollution Research 20 (3), 1632-1648 , 2013 2013 Citations: 20
Understanding the sources of heavy metal pollution in ambient air of neighboring a solid waste landfill site UH Mehta, DS Kaul, D Westerdahl, Z Ning, K Zhang, L Sun, P Wei, ... Aerosol Science and Engineering 6 (2), 161-175 , 2022 2022 Citations: 11
Assessment of role of water body on thermal comfort in ahmedabad, India H Gajjar, J Jai Devi IOP Conference Series: Earth and Environmental Science 281 (1), 012023 , 2019 2019 Citations: 9
Role of Azadirachta indica (Neem) and Polyalthia longifolia (Asopalav) trees for improving outdoor thermal environment in unorganized urban settings HH Gajjar, JD Jeyaraman, DS Kaul International Journal of Biometeorology 66 (10), 2055-2067 , 2022 2022 Citations: 7
Photo-active catalysts in building and construction materials for air pollution treatment: A bibliometric analysis A Nema, DS Kaul, K Mukherjee, JD Jeyaraman Materials Today: Proceedings 62, 7297-7301 , 2022 2022 Citations: 5
Outdoor thermal sensation scale through biometeorological assessment for semi-arid climate HH Gajjar, D Upadhyay, M Hussain, JD Jeyaraman International Journal of Biometeorology 69 (11), 2871-2881 , 2025 2025 Citations: 2
Probable linkage between aerosol and cloud in Successive Contrasting Monsoons (2008 and 2009) J Jai Devi, SN Tripathi, S Dey, M Michael, T Gupta Ann. Geophys., submitted , 2013 2013 Citations: 2
Assessment of different types of bricks in varying wall configurations in an indoor thermal environment for a semi-arid region HH Gajjar, JD Jeyaraman Architectural Science Review 67 (2), 173-188 , 2024 2024 Citations: 1
Effects of Interior and Exterior Shading Elements on the Indoor Thermal Environment for Buildings in a Semiarid Climate HH Gajjar, H Motiyani, Q Sameed, JD Jeyaraman Journal of Architectural Engineering 31 (1), 04024040 , 2025 2025
Development of a Low Cost Miniature Device for High Spatial, Distributed Monitoring of Aerosol Optical Depth for Regional Level Microclimatic Studies DS Kaul, H Gajjar, J Jai Devi, A Kandya IOP Conference Series: Earth and Environmental Science 281 (1), 012006 , 2019 2019
Effect of Different Land Use Generated Polluting Sources on Columnar Atmospheric Aerosol DS Kaul, H Gajjar, J Jeyaraman, AS Kandya AGU Fall Meeting Abstracts 2018, A21G-2722 , 2018 2018
The discoloration of the taj mahal: Source apportionment, source impacts & human health outcomes in Agra A Nagpure, L Luo, A Ramaswami, M Bergin, A Russell, S Tripathi, ... International Conference on Atmospheric Optics: Aerosols, Visibility, and … , 2016 2016
