Dataset Information

Human Activity Changes during COVID-19 Lockdown in China-A View from Nighttime Light.

ABSTRACT: Strict lockdowns were implemented in China to fight Coronavirus Disease 2019 (COVID-19). We explored the nighttime light (NTL) of China's four cities in five stages of COVID-19 including case free period, newly appeared period, rising period, outbreak period, and stationary period. Using six categories of points of interest (POIs) data ("company", "recreation", "healthcare", "residence", "shopping", and "traffic facility") and random forest models, we found that dimming light of four cities is associated with the epidemic development and human activity changes. When confirmed cases appeared, healthcare associated NTL radiance increased rapidly in Wuhan and Guangzhou, but decreased in the fourth and fifth stages. Companies in all cities were resuscitated in the fifth stage, while companies in Guangzhou was resuscitated in the fourth stage. Shopping related NTL radiance in Wuhan increased quickly in the fifth stage which indicated some resuscitation. In addition, compared to gross domestic product (GDP), the trend in electric power consumption (EPC) was consistent with the trend in NTL radiance. The above findings contribute to the making of control policies for COVID-19 as well as other infectious diseases.

SUBMITTER: Wang X

PROVIDER: S-EPMC9350096 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature

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Human Activity Changes During COVID-19 Lockdown in China-A View From Nighttime Light.

Wang Xuejun X Yan Guangjian G Mu Xihan X Xie Donghui D Xu Jiachen J Zhang Zhiyu Z Zhang Dingdan D

GeoHealth 20220801 8

Strict lockdowns were implemented in China to fight Coronavirus Disease 2019 (COVID-19). We explored the nighttime light (NTL) of China's four cities in five stages of COVID-19 including case free period, newly appeared period, rising period, outbreak period, and stationary period. Using six categories of points of interest data ("company," "recreation," "healthcare," "residence," "shopping," and "traffic facility") and random forest models, we found that dimming light of four cities is associat ...[more]

PMID: 35942293

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Project description:The novel coronavirus (COVID-19) has induced unprecedented improvements of air quality due to drastic shrinking of human activities during the pandemic lockdown in 2020. While declines of most air pollutants have been globally evidenced in most cities worldwide, there is few detailed spatial knowledge at local scale. Therefore, we present here a high resolution mapping of the 2018-2020 evolution of human activities and air pollutants in Wuhan. Human activities were assessed by nighttime light radiance. We measured the air quality index (AQI) as the maximum value among air quality sub-indices of SO2, NO2, CO, O3 and particulate matter. We also compared mean monthly pollutant concentration during January-April in 2018, 2019 and 2020. Mapping results show that variations of nighttime light radiance were heterogenous at local scale, showing both rises and declines in the same district. The radiance decreased in eight districts located mostly in the city center, as a result of lower human activity, but the radiance increased in the five surrounding districts, as a consequence of people staying at home. AQI was low during lockdown, averaging at 57, but showed strong daily variations with a slight pollution around February 5 with AQI rising to 126. During this pollution event, particulate matter, SO2, NO2 and CO levels were positively correlated, suggesting common sources, but were not correlated with ozone; and particulate matter, SO2, NO2 and CO decreased with relative humidity, suggesting removal by precipitation. Comparison of 2020 data with previous years shows that particulate matter and NO2 were highly reduced, CO was less reduced due to ongoing power industries, SO2 first declined then increased to exceed 2018-19 values due to coal combustion, and ozone levels was more abundant due both to less NOx pollution and the weekend effect.Supplementary informationThe online version contains supplementary material available at 10.1007/s10311-021-01222-x.

Dataset Information

Human Activity Changes during COVID-19 Lockdown in China-A View from Nighttime Light.

Publications

Human Activity Changes During COVID-19 Lockdown in China-A View From Nighttime Light.

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