02 Feb 2021

02 Feb 2021

Review status: this preprint is currently under review for the journal ACP.

Unexpected enhancement of ozone exposure and health risks during National Day in China

Peng Wang1,2, Juanyong Shen3, Men Xia1, Shida Sun4, Yanli Zhang2, Hongliang Zhang5,6, and Xinming Wang2 Peng Wang et al.
  • 1Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
  • 2State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
  • 3School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
  • 4Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin, China
  • 5Department of Environmental Science and Engineering, Fudan University, Shanghai, China
  • 6Institute of Eco-Chongming (IEC), Shanghai, China

Abstract. China is confronting increasing ozone (O3) pollution that worsens air quality and public health. Extremely O3 pollution occurs more frequently under special events and unfavorable meteorological conditions. Here we observed significantly elevated maximum daily 8-h average (MDA8) O3 (up to 98 ppb) during the Chinese National Day Holidays (CNDH) in 2018 throughout China, with a prominent rise by up to 120 % compared to the previous week. The air quality model shows that increased precursor emissions and regional transport are major contributors to the elevation. In the Pearl River Delta region, the regional transport contributed up to 30 ppb O3 during the CNDH. Simultaneously, aggravated health risk occurs due to high O3, inducing 33 % additional deaths throughout China. Moreover, in tourist cities such as Sanya, daily mortality even increases by up to 303 %. This is the first comprehensive study to investigate O3 pollution during CNDH at national level, aiming to arouse more focuses on the O3 holiday impact from the public.

Peng Wang et al.

Status: open (until 30 Mar 2021)

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Peng Wang et al.


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Short summary
Ozone (O3) pollution has received extensive attention due to the worsening air quality and rising health risks. The Chinese National Day Holidays (CNDH) is associated with intensive commercial and tourist activities, serves as a valuable experiment to evaluate O3 response during the holiday. We find sharply increasing trends of observed O3 concentrations throughout China during the CNDH, leading to 33 % additional total daily deaths.