With the rapid development of industrialization and urbanization, air pollution has become increasingly serious. According to the prediction of the Ministry of Ecology and Environment, due to the continuous high temperature and near-surface southerly wind transport, from June 4th to 15th, the air conditions in the Yangtze River Delta, South China, Northwest China and Northeast China are not ideal, and light to moderate pollution may occur.
Ozone is an allotrope of oxygen, which is a light blue gas with a special odor at normal temperature. When it is at an altitude of 10 to 50 kilometers above the ground, ozone can absorb ultraviolet rays and protect the earth's living things. But once the ozone reaches the ground level of about 10 to 100 meters from the ground, it becomes a "healthy killer."
Studies have shown that up to 48% of ozone in the near-surface ozone pollution comes from photochemical reactions of pollutants such as nitrogen oxides (NOx). Therefore, to control ozone pollution, from the root cause, it is necessary to reduce NOx emissions.
With the deployment of social sustainable development strategies, in recent years, China will accelerate the construction of photochemical monitoring networks to conduct monitoring of volatile organic compounds (VOCs) and NOx in key regions and cities. The state vigorously controls ozone pollution and cuts emissions of nitrogen oxides and volatile organic compounds in a certain proportion. Combined with pollution status, industrial characteristics, and economic and social development levels, we have adopted a strategy to differentiate and control the atmospheric conditions of each region.
As a fast online monitoring system for the spatial and temporal distribution of atmospheric fine particles and ozone with independent intellectual property rights in China, the atmospheric ozone detection laser pointer radar has improved the independent innovation capability and core competitiveness of the Chinese laser radar industry, and built the real-time monitoring capability of China's atmospheric environment. And data analysis provides a reliable technical means.
The atmospheric ozone detection laser radar uses the difference in absorption of the laser wavelength by ozone to determine the concentration of ozone on the common path of the pulsed laser, thereby realizing the detection of the temporal and spatial distribution of ozone. The system also integrates a variety of mature and stable laser radar core technologies, which can not only effectively monitor the contaminated area, determine its source and transportation, but also effectively prevent the upcoming major pollution events. Technical and equipment support is also provided for the transboundary transport of pollutants.
Nowadays, Lidar technology has been extensively equipped in the field of environmental monitoring, providing important technical means and high-end equipment for the study of ash and photochemical pollution. Since the establishment of a three-dimensional monitoring network in the Beijing-Tianjin-Hebei region by atmospheric fine particles and ozone lidar in 2013, the laser radar technology has maintained a good working condition and provided strong technical support for atmospheric monitoring in China.
Lidar technology is not only applied to the environmental protection business department, it studies the characteristics of atmospheric fine particles and the formation mechanism of ash, and carries out the detection of urban photochemical reaction process. It is also applied to the meteorological detection department to study the meteorological and climate change effects of aerosols.
In the hot summer afternoon to the evening, the sky is clear and the sky is full of clouds. At this time, the concentration of ozone is the highest, and people should reduce their outings and outdoor activities. When going out, sensitive people need to be protected. Appropriate increase in physical exercise, improve physical fitness, enhance immunity, and also reduce the damage of ozone to the upper respiratory tract.
Air environment management is a long process. Chinese enterprises should also start from their own, product design is more environmentally friendly, and motor vehicle emissions are cleaner. Everyone has done a meager effort to build our green and blue sky together.