In recent years, ozone has become an important factor affecting the air quality in summer in many parts of our country. Like smog, the harm of ozone should not be underestimated. Relevant studies have shown that when the ozone concentration reaches more than 200 micrograms/m3, it will damage the central nervous system, causing headaches, chest tightness, and decreased thinking ability. Therefore, as soon as the summer entered, various regions successively played a combination of ozone pollution prevention and control, and introduced various policies such as the treatment of pollution sources and the same treatment with PM2.5.
Ozone pollution can be counted as a kind of photochemical pollution, which is one of the typical secondary pollution. Pollutants are mainly produced by nitrogen oxides and volatile organic compounds under the background of high temperature and strong light. Most of them occur in sunny high temperature and low relative humidity, which is known as the killer under clear sky. Therefore, although both are one of the types of pollution that can be transmitted over long distances, NOx and VOCs emission sources can affect the generation of ozone in a range of hundreds of kilometers or even thousands of kilometers, but compared to PM2.5, ozone is mainly two types. The prevention and control of secondary pollutants mainly lies in the control of precursors VOCs and NOx.
Through the investigation and research of environmental issues, we know that volatile organic compounds come from industrial production such as petrochemical industry, organic chemical industry, surface coating, packaging and printing, etc., but also from daily life such as decoration, dry cleaning, and catering; nitrogen oxides mostly come from machinery Both of the exhaust emissions of motor vehicles have the characteristics of scattered sources and difficult control. Therefore, the prevention and control of ozone pollution will be a long-term and arduous task, which cannot be accomplished overnight. Continue to deepen the four major structural adjustments, and strive to achieve new breakthroughs in the control strategies of mobile sources, industrial sources and social life sources.
The generation and concentration distribution of ozone are greatly affected by weather conditions. The wind field and boundary layer will affect the concentration distribution and regional transport of ozone and its precursors, while the change of radiation (cloud cover) will affect the strength of the photochemical reaction of ozone generation. China has a vast territory and complex climate types. It spans three climatic regions of temperate, subtropical and tropical regions. Most regions are controlled by the East Asian monsoon. It is a world-famous monsoon region. The changes in seasonal weather conditions have a certain regularity. Summer is the season with the heaviest ozone pollution, while the southern region may have double peaks throughout the year. Abnormal weather conditions in different years (deviations from the average climate conditions) also often lead to abnormal ozone pollution.
Therefore, based on scientific knowledge, formulate an ozone pollution prevention and control plan that meets local characteristics. Adopting effective long-term VOCs and NOx emission reduction strategies and short-term response measures, precise implementation of policies, strengthening of supervision, seasonal regulation, targeted governance, curbing the deteriorating trend of ozone pollution, reducing the level of ozone pollution, and reducing the number of days of ozone pollution is the current government control of ozone One direction of pollution.
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