Spatial variation of Aerosol Optical Depth and Solar Irradiance over Delhi -NCR during Summer season

Bhardwaj, Purnima; Pandey, Alok Kumar; Kumar, Krishan; Jain, V. K.

doi:10.12944/cwe.12.2.22

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Furthermore, alterations in the city's structure and the resulting impact on air quality also contribute to the instability of urban climates. 32 This paper incorporates 37 publications that have conducted studies on UHI. Most of these publications concentrate on the capital city, which is unsurprising given its significance.…”

Section: The Development Of Urban Heat Islands In Indiamentioning

confidence: 99%

A Study on Urban Heat Island (UHI): Challenges and Opportunities for Mitigation

Yadav,

Singh

2024

Curr. World Environ

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Urban Heat Island (UHI) is a significant issue in metropolitan regions in India, where cities are experiencing increasing temperatures ranging from 1 to 5 °C. Although UHI is a global phenomenon, it particularly impacts major cities in India, and there is a need for more research in this field. This review compares the latest global developments in UHI research with the current research in India, highlighting areas where India may lag. The review notes that there is a lack of research on UHI in numerical modeling in India, which is a limitation. Because of this, finding a solution to UHI and putting it into law requires more focus and effort. Urgent measures are required to lessen the effects of UHI in urban areas of India. Parameter outputs such as Land Surface Temperatures (LST), Normalized Difference Vegetation Index (NDVI), Land Use/Land Cover (LULC), and Normalized Difference Built-up Index (NDBI) were also compared with the results of prior research and modules in the review. Using correlations from three prior studies, the analysis demonstrated that the temperature deviation approximation was 0.157 °C better than last year's manuals. Consequently, additional research is needed to address urban heat islands (UHI) in Indian cities, focusing on numerical modeling. Prompt legislative and policy responses are also necessary. The review emphasizes the importance of ongoing research into UHI in India and measures to mitigate its effects.

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Section: The Development Of Urban Heat Islands In Indiamentioning

confidence: 99%

A Study on Urban Heat Island (UHI): Challenges and Opportunities for Mitigation

Yadav,

Singh

2024

Curr. World Environ

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“…Three locations, Jahangirpuri in north Delhi and Sonipat and Panipat in the state of Haryana (north to New Delhi) located along the national highway connecting New Delhi to North India were selected for this study. The study sites are both residential and industrial type with lots of agricultural activities [12]. All three locations remain inflicted with high air pollution due to vehicular and industrial emissions.…”

Section: Study Area and Data Collectionmentioning

confidence: 99%

Assessment of impact of COVID-19 lockdown on air quality in national capital region of New Delhi, India

Antil

Yadav

Chaudhary

2022

Holist. approach environ.

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After the World Health Organization declared COVID-19 as pandemic on 11th March 2020, the Indian government adopted a complete phased lockdown strategy starting from 23rd March until 31st May 2020. During this period, road/rail/air traffic, industrial operations and offices were completely restricted except for the essential services. Here, an attempt was made to assess the effect of the lockdown period on five pollutants: PM10, PM2.5, SO2, NOx, and ozone at three sites, Jahangirpuri in North Delhi and Sonipat and Panipat townships located along the national highway leading to north India. These pollutants, except ozone, decreased at all sites during lockdown phase 1 compared to before lockdown. PM2.5 load reduced by 28.1, 33.5, and 40.8 % at Jahangirpuri, Sonipat and Panipat, respectively. PM10 remained either close to or higher than National Ambient Air Quality Standards (NAAQS) due to prevailing high-speed winds. NO2, a precursor for formation of O3 decreased consistently at all sites, except an increase in phase 3 at Panipat whereas O3 consistently increased. This was a paradoxical situation as O3 is formed by photochemical reactions among NOx and volatile organic compounds, which require further detailed studies. These observations indicate that air pollutants decreased specific to the site(s) and pollutant(s). Such restriction can be applied in the future to control air pollution in this region.

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Image based analytical approaches for study of particulate matter (PM) in air

Tiwari,

Pandey,

Tirkey

et al. 2024

Front. Environ. Sci.

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Particulate matter (PM) stands as a predominant pollutant in developing countries, demanding effective source identification and remediation strategies. This review centers on the scanning electron microscopy (SEM) image-based methodology for PM analysis, particularly emphasizing the passive technique of utilizing plant leaves for PM capture. The SEM-image-based approach serves as a powerful tool for unraveling the morphological characteristics of PM, crucial for source identification. Additionally, SEM, when equipped with energy dispersive spectroscopy (EDS), enables chemical and mineralogical characterization, providing insights into the origin of PM. The first part of the review describes the plant as the best bio-sampler for PM. In this context, removal of PM from the environment through plant-based interventions is described. Subsequently, the application of SEM for size-based analysis using ImageJ and morphological analysis for source identification of PM is detailed. Following this, the PM chemical and mineralogical composition for source identification are described based on EDS analysis. Image-based techniques play a pivotal role in selecting the most effective plant species for PM removal from the air. The review comprehensively outlines the morphological, chemical, and mineralogical attributes utilized for PM source identification and their subsequent remediation by plants. Finally, the benefits of SEM-image-based techniques for PM analysis are elucidated. This review offers a holistic understanding of the SEM-EDS and plant-based approach, presenting a promising avenue for addressing PM pollution and enhancing environmental quality.

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Spatial variation of Aerosol Optical Depth and Solar Irradiance over Delhi -NCR during Summer season

Cited by 3 publications

References 24 publications

A Study on Urban Heat Island (UHI): Challenges and Opportunities for Mitigation

A Study on Urban Heat Island (UHI): Challenges and Opportunities for Mitigation

Assessment of impact of COVID-19 lockdown on air quality in national capital region of New Delhi, India

Image based analytical approaches for study of particulate matter (PM) in air

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