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Deepen understanding of air pollution mechanism

Credit: AAS

The Earth’s atmosphere has a budget, and when costs outweigh savings, secondary aerosols form in over-polluted areas. When greenhouse gases enter the atmosphere, free radicals bind to the molecules and inactivate them. However, if there are more polluting molecules than free radicals, they recombine to form ozone and visible particulate matter, smog and haze.


According to Professor Wang Yuesi of the State Key Laboratories for Atmospheric Boundary Layer Physical Chemistry (LAPC), the exact mechanism underlying this atmospheric oxidation capacity is not well understood and the process is not well explained. Completely overlooked in research. (IAP), Chinese Academy of Sciences (CAS).

WANG and co-author Liu Zirui, also with LAPC, wrote the preface to the special issue. Advances in atmospheric science (AAS).

“This special issue focuses on the quantification and simulation of atmospheric oxidation capacity processes and explores the role of missing mechanisms involved in the formation of secondary aerosols in more detail,” Wang said. I am.

The AAS Special Issue contains 14 recently published issues. Scientific treatise Investigation of atmospheric oxidation capacity process by various approaches. The treatise includes field observations of major oxidized species. Different environment, Laboratory mechanics research on ozone generation, etc.

WANG co-authored three notable papers, including one that quantifies free radical balance and ozone production with numerical modeling. In this study, Wang and his co-authors found that aerosol uptake of superoxide, composed of hydrogen and two oxygen atoms, helped decompose certain pollutants, resulting in a fundamentally free radical balance. Increased by 11% to reduce ozone during the day. 14% production.

“This suggests a synergistic effect. mechanism Elucidation of complex air pollution formation will help develop environmental measures, “said Wang, pointing out that this study has led to a deeper understanding of the mechanism of atmospheric oxidation capacity.

He and his team have developed an indicator, or indicator, that characterizes Beijing’s atmospheric oxidation capacity. Next, they will evaluate how the indicators apply in other highly polluted areas of China, while further studying the relationship between indicators and air quality.

According to Wang, this is an example of a type of research that the special issue emphasizes and demands more.

“For the atmosphere, more detailed analysis and attribution is still needed. Oxidation Capacity quantification and simulation to better understand the secondary formation process and improve the underlying mechanism, “said Wang.


Atmospheric nitrite chemistry reveals a significant underestimation of oxidizing capacity in northern China


For more information:
Yuesi Wang et al, Preface to Special Issue on Atmospheric Oxidizing Capability, Ozone, and PM2.5 Pollution: Quantification Methods, Formation Mechanisms, Simulations, and Controls, Advances in atmospheric science (2021). DOI: 10.1007 / s00376-021-1001-6

Min Xue et al, Summer ROx Budgets and O3 Formation at the Xianghe Suburban Site in the North China Plain, Advances in atmospheric science (2021). DOI: 10.1007 / s00376-021-0327-4

Quote: Deepen understanding of air pollution mechanism (June 11, 2021) Obtained from https://phys.org/news/2021-06-air-pollution-mechanisms.html on June 11, 2021

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Deepen understanding of air pollution mechanism

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