Page 34 - e-Book

Analysis of the Quality of Air during COVID Era

Air quality has been deteriorating at an alarming speed but the lockdowns and the restrictions
imposed to curb the spread of coronavirus during 2020 and 2021 has shown a significant

improvement in the quality of air as reported by various researchers throughout the world.

S.No. Name of Outcome of the study
Researchers

1. Cadotte In six cities Shanghai, Wuhan, Milan, Hong Kong, Seoul and Kyoto
(2020) air quality was compared for the month of February 2019 and 2020

and found air quality improved due to restrictions imposed due to
COVID-19.

2. Connerton et Social distancing and quarantine policies are beneficial for cleaning

al, (2020) the air.
3. Chen et al. Reduction of carbon monoxide (CO) and nitrogen dioxide (NO2)

(2020) was observed in United states during the early phase of lockdown.

4. He, Pan & The air quality improved remarkably in China during lockdown
Tanaka (2020) imposed due to Coronavirus.

5. Kumari & Concentration of pollutants reduced alarmingly during lock down
Toshniwal phase as found in Central Pollution Control Board (CPCB) online

(2020) portal in cities of Mumbai, Delhi and Singrauli located in western,

northern and eastern part in India.
6. Mahato, Pal & If the pollution source be attenuated, the environment can cure itself

Ghosh (2020) in an appropriate time period.
7. Marlier et al, In China for the month January and February of 2019 and 2020

(2020) there was a remarkable reduction of 48% in (PM2.5) concentrations,

11% in sulphur dioxide and 49% in nitrogen dioxide mainly due to
measures taken for quarantine.

8. Masum & Pal In Chittagong city in Bangladesh, it was found that except NO2, all

(2020) other pollutants PM10, PM2.5, NO2, SO2 and CO showed statistically
significant decrease due to lockdown.

9. Saadat, Due to change in the life style of the people and shutting down of
Rawtani & businesses during COVID-19 pandemic water pollution dropped and

Hussain air quality improved.
(2020)

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