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[Ozone Pollution Characteristics and Formation Mechanism in a Typical Tropical Seaside City]
Shu-Yan Han1, Xin Zhang1, Rong-Fu Xie2
1Environment Research Institute, Shandong University, Qingdao 266237, China.
Huan Jing Ke Xue= Huanjing Kexue
|November 16, 2023
Summary
Ozone pollution in Haikou peaks in September and October, driven by elevated nitrogen oxides (NOx) and volatile organic compounds (VOCs). Effective control requires a 1:1 to 4:1 reduction ratio of VOCs to NOx.
Area of Science:
- Atmospheric Chemistry
- Environmental Science
Context:
- Haikou, a tropical seaside city, experiences significant ambient air ozone (O3) pollution.
- Observational experiments were conducted from June to October 2019 to study O3 and its precursors.
Purpose:
- To investigate O3 pollution characteristics and formation mechanisms in Haikou.
- To determine O3-NOx-VOCs sensitivities and identify key precursors.
- To propose effective O3 pollution control strategies.
Summary:
- Ozone pollution in Haikou predominantly occurs in September and October, with daily maximum 8-h concentrations ranging from 39-190 μg·m⁻³ and a unimodal daily variation peaking around 14:00.
- Elevated concentrations of nitrogen dioxide (NO2) and volatile organic compounds (VOCs) during pollution episodes, coupled with regional transport from the northeast, contribute to O3 formation.
- Haikou's O3-NOx-VOCs sensitivity lies in a transitional regime, with September's O3 formation being most sensitive to anthropogenic VOCs and October's to NOx.
Impact:
- Findings highlight the critical role of NOx and VOCs as O3 precursors in tropical urban environments.
- Identified O3-NOx-VOCs sensitivities provide crucial data for targeted emission control strategies.
- A recommended VOCs to NOx reduction ratio of 1:1-4:1 offers a quantitative guideline for mitigating O3 pollution in Haikou.
Keywords:
Haikou CityO3-NOx-VOCs sensitiviyobservation-based model(OBM)ozone(O3)pollution characteristicsMore Related Videos
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