Influence of Air Pollution on Coronavirus (COVID-19): Some Evidences from Studies at AUH, Gurugram, India

Devara, P. C. S.; Kumar, Ashutosh; Sharma, Preeti; Banerjee, Padmakali; Khan, Aijaz Ahmad; Tripathi, Amitandra Kumar; Tiwari, Subodh; Beig, G.

doi:10.2139/ssrn.3588060

Cited by 12 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further, a comparison of the March 2020 values for these cities suggested an 18% reduction due to COVID-19 lockdown. These results also match closely with the reduction in NO 2 reported for some of the cities using ground-based measurements 6,7 . Also, correlating the TROPOMI tropospheric NO 2 data for the April lockdown period suggested a Pearson (r) of 0.33.…”

Section: Variations In No 2 Based On the Population Ranksupporting

confidence: 87%

“…To generate time series of NO 2 columns over 41 different cities, we first selected pixels from an overpass area, defined by a different buffer radius (30, 45, 60, 75, 90 in km from the city center). We used data for which the quality assurance value is higher than 0.5 and the cloud fraction within the NO 2 retrieval window is below 40% 6 . The averaged tropospheric NO 2 column for each city within the buffer radius is calculated as, where, is the average value of the data for each city during the time period of observations, is the average value of the data for each grid cell ‘k’ within the buffer radius (in km), for each day ‘d’ of the month, over the time period of the observations and ‘ ’ being the total number of days of observations for each city within a specific period, i.e., before or after lockdown.…”

Section: Methodsmentioning

confidence: 99%

“…As a result of the COVID-19 pandemic, during March 25th-May 3rd, 2020 entire India was lockdown. As a result, there was reduction in pollution in Indian cities too 6,7 . However, the specific amount of pollution decrease is not well-documented covering multiple cities in India, hence the focus of this study.…”

Section: Questions Addressedmentioning

confidence: 99%

See 2 more Smart Citations

Spatial and temporal variations of air pollution over 41 cities of India during the COVID-19 lockdown period

Vadrevu

Eaturu

Biswas

et al. 2020

Sci Rep

114

View full text Add to dashboard Cite

In this study, we characterize the impacts of COVID-19 on air pollution using NO2 and Aerosol Optical Depth (AOD) from TROPOMI and MODIS satellite datasets for 41 cities in India. Specifically, our results suggested a 13% NO2 reduction during the lockdown (March 25–May 3rd, 2020) compared to the pre-lockdown (January 1st–March 24th, 2020) period. Also, a 19% reduction in NO2 was observed during the 2020-lockdown as compared to the same period during 2019. The top cities where NO2 reduction occurred were New Delhi (61.74%), Delhi (60.37%), Bangalore (48.25%), Ahmedabad (46.20%), Nagpur (46.13%), Gandhinagar (45.64) and Mumbai (43.08%) with less reduction in coastal cities. The temporal analysis revealed a progressive decrease in NO2 for all seven cities during the 2020 lockdown period. Results also suggested spatial differences, i.e., as the distance from the city center increased, the NO2 levels decreased exponentially. In contrast, to the decreased NO2 observed for most of the cities, we observed an increase in NO2 for cities in Northeast India during the 2020 lockdown period and attribute it to vegetation fires. The NO2 temporal patterns matched the AOD signal; however, the correlations were poor. Overall, our results highlight COVID-19 impacts on NO2, and the results can inform pollution mitigation efforts across different cities of India.

show abstract

Section: Variations In No 2 Based On the Population Ranksupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Spatial and temporal variations of air pollution over 41 cities of India during the COVID-19 lockdown period

Vadrevu

Eaturu

Biswas

et al. 2020

Sci Rep

114

View full text Add to dashboard Cite

show abstract

“…Over other regions around the world, studies (Devi et al, 2020;Fan et al, 2020;Siciliano et al, 2020;Xu et al, 2020) have noted a reduction in pollution and improvement of air quality during the lockdown period. Recent studies focusing on the early stages of the lockdown studies have reported a decrease in atmospheric pollutants over different regions in the Indian subcontinent (Devara et al, 2020;Jain and Sharma, 2020;Mahato et al, 2020;Sharma et al, 2020). Devara et al (2020)…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies focusing on the early stages of the lockdown studies have reported a decrease in atmospheric pollutants over different regions in the Indian subcontinent (Devara et al, 2020;Jain and Sharma, 2020;Mahato et al, 2020;Sharma et al, 2020). Devara et al (2020)…”

Section: Introductionmentioning

confidence: 99%

Impact of COVID-19 Control Measures on Trace Gases (NO2, HCHO and SO2) and Aerosols over India during Pre-monsoon of 2020

Biswas

Ayantika

2021

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

To prevent the transmission of COVID-19, India implemented country-wide restrictions on socioeconomic activities. Using satellite observations for the pre-monsoon (March-April-May) season, we explore the effect of the extended lockdown, on nitrogen dioxide (NO2), formaldehyde (HCHO), sulfur dioxide (SO2) and aerosol optical depth (AOD) over India. In this present study we evaluate and quantify the changes in pollutants across six different geographical zones along with the six most populous cities in the country. During April-May the lockdown have resulted in a net decrease in NO2 column density over India in 2020 compared to 2017-2019 average for the same months. Maximum average seasonal reduction of both NO2 (-5.6%) and HCHO (-1.3%) occured over southern India (SI). Compared to March and April, anomalous HCHO for all the regions decreased in May. Anomalous surface cooling induced lower volatile organic carbons (VOCs) emission and slower VOC oxidation due to absence of high nitric oxide led to decrease in HCHO. A reduction in NO2 was also seen over the top six populous Indian cities, with Mumbai recording the highest decrease (-33.7%). But only Chennai showed a substantial decrease (-6.8%) in HCHO. A significant seasonal reduction in SO2 was noted over western India (WI) and SI. Additionally, widespread decline covering all the zones was found in the pre-monsoon AOD. In April, the decrease occurred primarily over the Indo-Gangetic-Plains (IGP) and eastern India, while in May a marked homogeneous reduction was noted over entire India. Aerosol induced attenuation of incident solar radiation leads to concurrent changes in MERRA2 insolation during pre-monsoon of 2020. Furthermore, reduced anthropogenic aerosols resulted in reduction of avaible cloud condensation nuclei (CCN) leading to larger cloud droplet size and hence increased precipitation during pre-monsoon, 2020.

show abstract

Assessment of air pollution status during COVID-19 lockdown (March–May 2020) over Bangalore City in India

Gouda

Singh

et al. 2021

Environ Monit Assess

View full text Add to dashboard Cite

The coronavirus disease 2019 (COVID-19), which became a global pandemic by March 2020, forced almost all countries over the world to impose the lockdown as a measure of social distancing to control the spread of infection. India also strictly implemented a countrywide lockdown, starting from 24 March to 12 May 2020. This measure resulted in the reduction of the sources of air pollution in general: industrial, commercial, and vehicular pollution in particular, with visible improvement in ambient air quality. In this study, the impact of COVID-19 lockdown on the ambient concentration of air pollutants over the city of Bangalore (India) is assessed using Continuous Ambient Air Quality Measurement (CAAQM) data from 10 monitoring stations spread across the city. The data was obtained from Central Pollution Control Board (CPCB) and Karnataka State Pollution Control Board (KSPCB). The analysis of the relative changes in the ambient concentration of six major air pollutants (NO, NO 2 , NO X , PM 2.5 , O 3 , and SO 2 ) has been carried out for two periods: March–May 2020 (COVID-19 lockdown) and the corresponding period of 2019 during when there was no lockdown. The analysis revealed significant reduction in the concentration of ambient air pollutants at both daily and monthly intervals. This can be attributed to the reduction in sources of emission; vehicular traffic, industrial, and other activities. The average reduction in the concentration of NO, NO 2 , NO X , PM 2.5 , and O 3 between 01 March and 12 May 2020 was found to be 63%, 48%, 48%, 18%, and 23% respectively when compared to the same period in 2019. Similarly, the comparative analysis of pollutant concentrations between pre-lockdown (01–23 March 2020) and lockdown (24 March–12 May 2020) periods has shown a huge reduction in the ambient concentration of air pollutants, 47.3% (NO), 49% (NO 2 ), 49% (NO X ), 10% (SO 2 ), 37.7% (PM 2.5 ), and 15.6% (O 3 ), resulting in improved air quality over Bangalore during the COVID-19 lockdown period. It is shown that the strict lockdown resulted in a significant reduction in the pollution levels. Such lockdowns may be useful as emergency intervention strategies to control air pollution in megacities when ambient air quality deteriorates dangerously.

show abstract

Influence of Air Pollution on Coronavirus (COVID-19): Some Evidences from Studies at AUH, Gurugram, India

Cited by 12 publications

References 0 publications

Spatial and temporal variations of air pollution over 41 cities of India during the COVID-19 lockdown period

Spatial and temporal variations of air pollution over 41 cities of India during the COVID-19 lockdown period

Impact of COVID-19 Control Measures on Trace Gases (NO2, HCHO and SO2) and Aerosols over India during Pre-monsoon of 2020

Assessment of air pollution status during COVID-19 lockdown (March–May 2020) over Bangalore City in India

Contact Info

Product

Resources

About