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FYP2021: Impact of city lockdown measurement on air quality in six cities in China during COVID-19

SURF2021: Development of an automatic controlling module for greenhouse gas online measurements

SURF2021: Development of an automatic controlling module for greenhouse gas online measurements

FYP 2021 by Jiayue Wang


This is the FYP by Jiayue Wang (2021).


Corona Virus Disease 2019 (COVID-2019) is considered as a disaster in year 2020 for human beings and in order to prevent spread of this disease, a lot of countries have published a specific policy called lockdown measurement including China. During lockdown period, nearly all of public transportation and factories were closed and shut down. The lockdown measurement has negative effect on human-beings not only for public health but also for economy. However, this lockdown time gives scientists a unique opportunity to investigate human activities effects on air quality. This study chooses six typical cities (Beijing, Shanghai, Wuhan, Huanggang, Xi’an and Guangzhou) in China and compare air quality in year 2020 and previous years (2015-2019). In addition, daily primary pollutants are determined and linked with human activities. It is found that air quality is better in six cities during lockdown time. In addition, PM pollution decreased a lot during lockdown time although O3 pollution increased. Meteorological condition is not a main factor during lockdown after lockdown time, with the economy recovery, air quality is getting worse gradually but it do not reach previous level. In last 20 years, China published a series measurements and policies to reduce air pollution but some of them were not efficient. Hence, this research uses data evidence to show the interactions between human activities and air quality, which could give a reference for policy makers. For future studies, it is suggested that monitoring and exploring air quality after lockdown time and trying to find the relationships between economic recovery and air condition.


COVID-19, lockdown policy, air quality, PM pollution, O3 pollution

Table of Contents

Acknowledgements 1
Abstract 3
1.1.2 Interactions between human activities and air quality 6
1.1.3 Chinese policies about air pollution 7
1.2 Gaps and research aims 9
2. Data and methodology 10
2.1 Workflow 10
2.2 Dataset and variables 11
2.3 Research scale 12
2.3.1 Time scale 12
2.3.2 Spatial scale 13
2.4 Evaluation method 14
3. Results 15
3.1 AQI comparation 15
3.2 Air quality standard comparison during lockdown 17
3.3 PM10 and SO2 pollution situation 19
3.4 Primary pollutants 21
3.5 Lockdown policy 23
4. Discussions 23
4.1 AQI and meteorological factors 23
4.2 Air pollutants change with human activities 25
4.3 O3 concentration during the lockdown period 26
4.4 Air quality under economy recover 27
4.5 Further directions and policies for human activities to reduce city air pollution. 28
5. Conclusion 29
6. References: 30


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