Lack of air quality monitoring of photochemical pollution

(Reporter Li Wei) “At present, China has established a national air environment monitoring network with key cities with environmental protection as its main nodes and cities with cities and cities as its backbone, but the published pollution index is low, with only sulfur dioxide and respirable. Particles (PM10), lack of monitoring data on pollution from other new toxic and hazardous characteristics such as photochemical reaction pollution, and the release of urban air quality information in China are in urgent need of improvement.” Ren Xiao, Associate Professor, School of Law, Renmin University of China, interviewed by Science and Technology Daily on January 21. Indicated.

In recent years, air pollution has become one of the most important environmental problems that have plagued many cities in China. According to data released by the Ministry of Environmental Protection, in 2009, Nanjing’s ashes weather reached 221 days, Shanghai reached 134 days, and Chongqing was 133 days. The bad air quality affects the lives of hundreds of millions of urban residents, especially physical health.

Zhu Zhongjun, an engineer at the Chinese Society of Environmental Sciences, said that the potential health effects of air pollution on the human body can be divided into short-term acute and long-term chronic effects. Short-term exposure usually means that the exposure dose is between 1 hour and 1 day. Chronic effects generally refer to continuous exposure to 70 years of life. Obtaining relevant pollution index information can help residents rationally arrange their own trips and outdoor exercise, etc., to avoid or reduce the public risks of air pollution to health as much as possible.

According to the results, in addition to the monitoring and publication of a relatively small pollution index, most of the urban and urban areas in China still lack regular monitoring points for urban air, and ambient air monitoring is concentrated in urban areas. Lack of urban centers, newly built urban areas, and cities The multi-level monitoring of the surrounding areas and vast areas of the background also did not release air quality information for specific monitoring sites; due to the constraints of previous conditions, the current monitoring factors are still confined to the traditional coal-burning pollution, lack of photochemical reaction pollution and other new Monitoring of toxic and hazardous characteristics of pollution, lack of monitoring of environmental changes such as greenhouse gases.

According to foreign studies, 11 pollutants such as sulfur dioxide, nitrogen dioxide, respirable particulate matter, ozone, volatile organic compounds, carbon monoxide, lead, mercury, and dioxins all have relatively high levels of health hazards to the human body.

Ma Jun, director of the Public Environment Research Center, suggested that China should carry out monitoring and information release of PM2.5 indicators as soon as possible; carry out monitoring and release of ozone, carbon monoxide, and volatile organic compounds; and include heavy metals such as lead and mercury. Monitoring and publishing objects. It is also necessary to increase the number of monitoring sites and pay attention to scientific deployment. In particular, the current exhaust emissions of motor vehicles have become an important source of urban air pollution. Special monitoring sites should be set up near new sources of pollution, such as roads, and the concentration value information of specific monitoring indicators should be disclosed. Specific monitoring of air quality information; publicizing real-time monitoring data for air pollutants, publishing air quality information in combination with maps, and providing historical data; regularly reviewing air quality standard mechanisms, early warning mechanisms, mechanisms for promoting public awareness of self-protection, etc. .

The People's University of China School of Law and the Public Environment Research Center jointly published the results of 30 public air quality evaluations of Chinese and foreign cities on January 19 in Beijing. The evaluation shows that China's cities all carry out certain air quality information release, but there is a certain gap between the release level and the developed country cities.

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