Enhanced secondary pollution offset reduction of primary emissions during COVID-19 lockdown in China

Huang, Xin; Ding, Aijun; Gao, Jian; Zheng, Bo; Zhou, Derong; Qi, Ximeng; Tang, Rong; Ren, Chuanhua; Nie, Wei; Chi, Xuguang

doi:10.31223/osf.io/hvuzy

Cited by 117 publications

(176 citation statements)

References 50 publications

Supporting

Mentioning

153

Contrasting

Order By: Relevance

“…These in consequence affect emissions of air pollutants, especially from the transport and industry sectors, which are significant sources of NO x (NO x ¼ NO 2 + NO) in cities. Several studies presented a large decrease of NO 2 concentration during the lockdown period in China from both in situ and satellite observations (Huang et al, 2020;Wang et al, 2020). Tropospheric NO 2 column concentrations observed by the TROPOMI (TROPOspheric Monitoring Instrument) on the Sentinel-5P satellite decrease about 35% over China and some areas up to 60% during the COVID-19 regulation period compared to the same period of 2019 (Bauwens et al, 2020;Liu et al, 2020;Zhang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

NOx emissions reduction and rebound in China due to the COVID-19 crisis

Ding

Eskes

et al. 2020

Preprint

View full text Add to dashboard Cite

During the COVID-19 lockdown (24 January-20 March) in China low air pollution levels were reported in the media as a consequence of reduced economic and social activities. Quantification of the pollution reduction is not straightforward due to effects of transport, meteorology, and chemistry. We have analyzed the NO x emission reductions calculated with an inverse algorithm applied to daily NO 2 observations from TROPOMI onboard the Copernicus Sentinel-5P satellite. This method allows the quantification of emission reductions per city and the analysis of emissions of maritime transport and of the energy sector separately. The reductions we found are 20-50% for cities, about 40% for power plants, and 15-40% for maritime transport depending on the region. The reduction in both emissions and concentrations shows a similar timeline consisting of a sharp reduction (34-50%) around the Spring festival and a slow recovery from mid-February to mid-March.

show abstract

Section: Introductionmentioning

confidence: 99%

NOx emissions reduction and rebound in China due to the COVID-19 crisis

Ding

Eskes

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The rapid transmission of the COVID-19 pandemic has become a major health threat globally. In late December 2019, an epidemic of pneumonia linked with novel coronavirus disease-2019 (COVID-19) (Huang et al 2020a, b;Wu et al 2020) that has its epicenter in Wuhan, China, has spread over 215 countries worldwide (WHO 2020a). The COVID-19 epidemic was declared a public health emergency at a global level by the World Health Organization (WHO) on Jan 30, 2020 (WHO 2020b).…”

Section: Introductionmentioning

confidence: 99%

“…The COVID-19 epidemic was declared a public health emergency at a global level by the World Health Organization (WHO) on Jan 30, 2020 (WHO 2020b). The COVID-19 cases burst at an alarming rate with significant mortality (Wang et al 2020a, b) and have impacted human life and the world economy. The transmission of COVID-19 has mostly occurred between people via respiratory droplets and contact routes (Burke et al 2020;Chan et al 2020;Li et al 2020;Liu et al 2020a, b;WHO 2020c).…”

Section: Introductionmentioning

confidence: 99%

“…As per media intelligence, a massive reduction in air pollution due to lockdown has been observed in numerous countries by satellite pictures. A few scientific researchers also reported a significant augmentation in air quality because of COVID-19 lockdown worldwide (Cadotte 2020;Dantas et al 2020;He et al 2020;2020a, b;Isaifan 2020;Kerimray et al 2020;Muhammad et al 2020;Ogen 2020;Shrestha et al 2020;Sicard et al 2020;Wang and Su 2020;Wang et al 2020a, b, Zhu et al 2020 and in India (Chauhan and Singh 2020;Gautam 2020;Mahato et al 2020;Saadat et al 2020;Sharma et al 2020).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

COVID-19 lockdown: a boon in boosting the air quality of major Indian Metropolitan Cities

et al. 2020

View full text Add to dashboard Cite

The COVID-19 lockdown has not only helped in combating the community transmission of SARS-CoV-2 but also improved air quality in a very emphatic manner in most of the countries. In India, the first phase of COVID-19 lockdown came into force on March 25, 2020, which was later continued in the next phases. The purpose of this study was to investigate the result of lockdown on air quality of major metropolitan cities—Delhi, Mumbai, Kolkata, Chennai, Bengaluru, Hyderabad, Jaipur, and Lucknow—from March 25 to May 3, 2020. For this study, the concentration of six criteria air pollutants (PM 2.5 , PM 10 , CO, NO 2 , SO 2 , and O 3 ) and air quality index during the COVID-19 lockdown period was compared with the same period of the previous year 2019. The results indicate a substantial improvement in air quality with a drastic decrease in the concentration of PM 2.5 , PM 10 , CO, and NO 2 , while there is a moderate reduction in SO 2 and O 3 concentration. During the lockdown period, the maximum reduction in the concentration of PM 2.5 , PM 10 , CO, NO 2 , SO 2 , and O 3 was observed to be − 49% (Lucknow), − 57% (Delhi), − 75% (Mumbai), − 68% (Kolkata), − 48% (Mumbai), and − 29% (Hyderabad), respectively. The value of the air quality index (AQI) also dwindled significantly during the COVID-19 lockdown period. The maximum decline in AQI was observed – 52% in Bengaluru and Lucknow. The order of AQI was satisfactory > moderate > good > poor and the frequency order of prominent pollutants was O 3 > PM 10 > PM 2.5 > CO > NO 2 > SO 2 during the lockdown period in all the aforementioned metropolitan cities. Graphic abstract

show abstract

“…On 29th December 2019, at Wuhan city, the capital of Hubei Province in China a new infectious disease was first identified (Huang et al 2020;Zhou et al 2020a, b) and then it spread all over the world. More than 11,635,939 confirmed cases of COVID-19, including 539,026 deaths, reported to the World Health Organization (WHO).…”

Section: Introductionmentioning

confidence: 99%

Impact of SARS-CoV-2 Pandemic Lockdown on Air Quality Using Satellite Imagery with Ground Station Monitoring Data in Most Polluted City Kolkata, India

Kabiraj

Gavli

2020

Aerosol Sci Eng

View full text Add to dashboard Cite

Immediate lockdown (March 24-May 31, 2020) of industrial activity and traffic flows has been announced by the government of India across the country after the declaration of World Health Organization that the Novel Coronavirus (SARS-CoV-2) outbreak is pandemic. In this study, we tried to estimate the air quality improvement during the pre-lockdown period (January 1-March 23, 2020) by comparing the lockdown period (March 24-May 31, 2020). From the results, we found the highest reduction in the concentration of NO 2 (81.98%) during the lockdown period. The average concentration of NO 2 was 51.57 µg/m 3 during pre-lockdown has changed to 9.29 µg/m 3. The average PM 2.5 concentration was 80.09 µg/m 3 during the pre-lockdown period has reduced to 20.24 µg/m 3 with 74.72% of reduction during the lockdown period. From the overall analysis of various parameters, we observed significant improvement with the range of 73.

show abstract

Enhanced secondary pollution offset reduction of primary emissions during COVID-19 lockdown in China

Cited by 117 publications

References 50 publications

NOx emissions reduction and rebound in China due to the COVID-19 crisis

NOx emissions reduction and rebound in China due to the COVID-19 crisis

COVID-19 lockdown: a boon in boosting the air quality of major Indian Metropolitan Cities

Impact of SARS-CoV-2 Pandemic Lockdown on Air Quality Using Satellite Imagery with Ground Station Monitoring Data in Most Polluted City Kolkata, India

Contact Info

Product

Resources

About