Discussion on the formation mechanism of severe haze in North China and its relationship with meteorological factors

In recent years, China's industrialization and urbanization have accelerated, generating high emissions of pollutants every year, which has significantly deteriorated the air quality of Chinese cities and threatened public health and the happiness of urban residents. More and more studies have shown that several megacities in China and more and more cities have experienced more severe smog pollution. The occurrence of haze seriously affects the healthy development of human beings, so the research on haze should be vigorously promoted. Although many studies have made considerable progress in the research of smog in recent years, there is no systematic and comprehensive assessment method. But scholars have not stopped the pace of research.This study takes Weinan City, Shaanxi, China as the research object, The paper describes the formation mechanism of haze and the combined effects of emission sources, chemical aerosol material formation and transformation, meteorology and climatic conditions. The mechanism of haze formation is relatively complicated. Aerosols are widely used in the research of haze composition.Organic aerosols have a very important impact on the Earth's radiation, visibility and air quality on a global scale. However, the formation of secondary pollution makes this process more complicated. Secondary organic aerosols (SOA), free radicals that form volatile organic compounds and particles with ozone (O3), hydroxyl (OH) and nitrate (NO3) and artificial volatile organic compounds (VOCs) are considered organic gases One of the most important components of sol. In the past few decades, many studies have been conducted to study the formation of SOA. However, due to the complex formation mechanism of SOA, no further reason has been clarified.The reasons for the formation of haze are more complicated. For the true solution of the haze problem is still the key for our scholars to solve in the future, the government should also formulate corresponding measures to reduce the early discharge of pollutants, control the haze from the source, in short A long way to go requires joint efforts from everyone.

Keywords:Haze  Aerosol  Meteorological conditions  Weinan