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Improvement in ambient-air-quality reduced temperature during the COVID-19 lockdown period in India

Author

Listed:
  • Subodh Chandra Pal

    (The University of Burdwan)

  • Indrajit Chowdhuri

    (The University of Burdwan)

  • Asish Saha

    (The University of Burdwan)

  • Rabin Chakrabortty

    (The University of Burdwan)

  • Paramita Roy

    (The University of Burdwan)

  • Manoranjan Ghosh

    (Indian Institute of Technology Kharagpur)

  • Manisa Shit

    (Raiganj University)

Abstract

The COVID-19 pandemic forced India as a whole to lockdown from 24 March 2020 to 14 April 2020 (first phase), extended to 3 May 2020 (second phase) and further extended to 17 May 2020 (third phase) and 31 May 2020 (fourth phase) with only some limited relaxation in non-hot spot areas. This lockdown has strictly controlled human activities in the entire India. Although this long lockdown has had a serious impact on the social and economic fronts, it has many positive impacts on environment. During this lockdown phase, a drastic fall in emissions of major pollutants has been observed throughout all the parts of India. Therefore, in this research study we have tried to establish a relationship among the fall in emission of pollutants and their impact on reducing regional temperature. This analysis was tested through the application of Mann–Kendall and Sen’s slope statistical index with air quality index and temperature data for several stations across the country, during the lockdown period. After the analysis, it has been observed that daily emissions of pollutants (PM10, PM2.5, CO, NO2, SO2 and NH3) decreased by − 1– − 2%, allowing to reduce the average daily temperature by 0.3 °C compared with the year of 2019. Moreover, this lockdown period reduces overall emissions of pollutants by − 51– − 72% on an average and hence decreases the average monthly temperature by 2 °C. The same findings have been found in the four megacities in India, i.e., Delhi, Kolkata, Mumbai and Chennai; the rate of temperature fall in the aforementioned megacities is close to 3 °C, 2.5 °C, 2 °C and 2 °C, respectively. It is a clear indicator that a major change occurs in air quality, and as a result it reduced lower atmospheric temperature due to the effect of lockdown. It is also a clear indicator that a major change in air quality and favorable temperature can be expected if the strict implementations of several pollution management measures have been implemented by the concern authority in the coming years.

Suggested Citation

  • Subodh Chandra Pal & Indrajit Chowdhuri & Asish Saha & Rabin Chakrabortty & Paramita Roy & Manoranjan Ghosh & Manisa Shit, 2021. "Improvement in ambient-air-quality reduced temperature during the COVID-19 lockdown period in India," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 23(6), pages 9581-9608, June.
    • Handle: RePEc:spr:endesu:v:23:y:2021:i:6:d:10.1007_s10668-020-01034-z
    DOI: 10.1007/s10668-020-01034-z
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    References listed on IDEAS

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    1. Abhishek Gupta & Amit Dhir, 2019. "Air quality assessment of Mandi Gobindgarh city of Punjab, India," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 21(2), pages 879-893, April.
    2. Christiana Figueres & Corinne Le Quéré & Anand Mahindra & Oliver Bäte & Gail Whiteman & Glen Peters & Dabo Guan, 2018. "Emissions are still rising: ramp up the cuts," Nature, Nature, vol. 564(7734), pages 27-30, December.
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