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• W3199996164 abstract "Seema Garg1, Navita Mahajan2, Namrata Pancholi3 ,Supriya Lamba4   Email ID:  seemagarg1 @gmail.com                        navitamahajan07@gmail.comAbstractA nationwide lockdown imposed in India initially for three weeks from 24th March to 14th April 2020 and extended up to 3rd May 2020. The COVID-19 pandemic has significantly affected economic activities all around the world. Due to the forced restrictions, pollution level in cities across the country drastically slowed down just within few days. This leads to number of discussions whether considering lockdown to be the effective alternative measures for controlling air pollution[4].  Though it took a huge amount of human lives as well as increased unemployment to the large extent, it puts a positive impression on the environment. To control and stop the speedy extend of this deadly virus or disease, the Government had imposed a strict lockdown on their citizens which created a constructive impact on the atmosphere. Air pollutant concentration had been investigated and analysed in this study to analyze the impact of lockdown on the environment. Based on the air pollutant concentration, Air Quality Index (AQI) is deliberated. The Air Quality Index indicates the most and least polluted cities in the world. A higher value of AQI represents the higher polluted city and a lesser value of Air Quality Index represents a less polluted city. The impact of lockdown on air quality with respect to air pollution has been studied in this work and it is observed that the air pollutant concentration has reduced in the city during the lockdown period. It has been also detected that the PM2.5 and PM10 are the most affecting air concentrator which controls the air quality of all the selected places during and after lockdown. The present study eventually worked on this direction to look upon the air quality scenario amidst the lockdown period scientifically with special reference to the megacity Delhi. With the aid of air quality data of seven pollutant parameters (PM10, PM2.5, SO2, NO2, CO, O3 and NH3) for  monitoring stations spread over the megacity ,National Air Quality Index (NAQI) to show the spatial pattern of air quality in pre and during-lockdown phases. To investigate the interrelationship among the various parameters the Pearson correlation analysis was conducted .The results demonstrated that during lockdown air quality is significantly improved. Among other pollutants, NO2 and CO level have also reduced during-lockdown phase. It was observed that during the lockdown period, the air quality index on most of the days was observed to be good and satisfactory in all the metropolitan cities that indicated an improvement in air quality due to a reduction in vehicular and industrial emissions.Keywords: Air Quality Index (AQI), Carbon monoxide (CO), Ground-level ozone (O3), Nitrogen dioxide (NO2), Covid-19    References[1] Amann M., Purohit P., Bhanarkar A.D., Bertok I., Borken-Kleefeld J., Cofala J., Heyes C., Kiesewetter G., Klimont Z., Liu J., Majumdar D. (2017), Managing future air quality in megacities: a case study for Delhi. Atmos. Environ. 2017;161:99–111. [2] Dholakia H.H., Purohit P., Rao S., Garg A. Impact of current policies on future air quality and health outcomes in Delhi, India. Atmos. Environ. 2013;75:241–248.[3] GoD: Government of Delhi Chapter 12, Transport, Economic Survey of Delhi, 2014–15. 2016. http://delhi.gov.in/wps/wcm/connect/DoIT_Planning/planning/economic+survey+of+dehli/economic+survey+of+delhi+2014+-+2015 Available at:[4] Mahato, S., Pal, S., & Ghosh, K. G. (2020). Effect of lockdown amid COVID-19 pandemic on air quality of the megacity Delhi, India. The Science of the total environment, 730, 139086. https://doi.org/10.1016/j.scitotenv.2020.139086[5]M. Jamal, S. Chakrabarty et al.  Microsyst Technol 24, 4217–4223 (2018). https://doi.org/10.1007/s00542-018-3724-6  [6] A. Santos, J. Ferre, Borrull, J. Pallares, L.F. Marsal, Physica Status Solidi (a), 2011, 208, 668.https://doi.org/10.1038/s41598-019-48253-7 [7] K.S. Chang, C.K. Chang, S.F. Chou, C.Y.Chen (2007),  Biosensors and Bioelectronics, 22, 2914, 2007. https://doi.org/10.1016/j.bios.2006.12.001" @default.
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• W3199996164 date "2021-09-18" @default.
• W3199996164 modified "2023-09-28" @default.
• W3199996164 title "A study of Air Quality Index During COVID-19 pandemic: with reference to Delhi" @default.
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