World health organization pm2.5 standard
The World Health Organization (WHO) considers that PM2.5 less than 10 is a safe value, while all these areas in China are above 50, close to 80. WHO has put forward very strict PM2.5 standards for countries, but most cities in the world can't meet the standards. For developing countries, WHO has also formulated standard values in three different stages, of which the first stage is the widest limit, and the new standard PM2.5 is unified with this limit, while the previous standard PM 10 is wider than the target value in the first stage, and the new standard has also improved it, which is consistent with the WHO first stage limit.
American pm2.5 standard
1997, the United States has increased the requirement for the upper limit of PM2.5 concentration in the national ambient air quality standard. In 2006, the United States revised the air quality standards and put forward stricter restrictions on PM2.5 concentration. According to current American standards, the upper limit of daily average concentration of PM 10 is 150μ g/m3, which is equivalent to the target value of PM 10 set by WHO in the first transition period. The upper limit of daily average concentration of PM2.5 is 35 μ g/m3, and the upper limit of annual average concentration is 15 μ g/m3, which is roughly equivalent to the third transition target value of PM2.5 set by WHO.
China pm2.5 National Safety Standard
China's PM2.5 standard adopts the widest limit set by WHO. In the standard, the annual and 24-hour average concentration limits of PM2.5 are set to 0.035 mg/m3 and 0.075 mg/m3, respectively, which are the same as the target values of the World Health Organization (WHO) during the transition period 1 stage.
The Ministry of Environmental Protection mentioned in the revised explanation that the pollution problem of PM2.5 in Beijing-Tianjin-Hebei, Yangtze River Delta and Pearl River Delta urban agglomerations is more prominent. "the relevant national policies also require strengthening the prevention and control of PM2.5 pollution in the above areas, and relevant parties require that PM2.5 projects be added to the standards. The sound is very high. " This new revision will incorporate the PM2.5 concentration value into the environmental air quality assessment and implement it nationwide. This is the first time that China has formulated the PM2.5 standard.
Wang Yuesi, a researcher, said that the United States has been studying the setting of PM2.5 limit for 20 years. At present, there is no research in China to determine how many standards are suitable for China people and climate zones, so international standards are adopted first.
The new standard is planned to be fully implemented on1October 20 16 1 day. The head of the Science and Technology Standards Department of the Ministry of Environmental Protection said that before 20 16, there are two ways to implement this standard in advance: one way is to designate some areas to implement this standard in advance according to the requirements of the State Council. Another way is for provincial governments to voluntarily implement this standard in advance according to the actual situation and the needs of regional environmental protection.
As can be seen from the above data, the pm2.5 standard adopted by China is the primary standard for developing countries in the first stage, which was formulated by the World Health Organization. The pm2.5 standard formulated by the world health organization is very strict, and even the United States has not reached this standard at present. Therefore, the road to improving air quality is long and long. When going out, you should also do a good job in protecting Puweixin Tiantong imported from the United States to prevent inhalation of smog. I wish you the best of health!
Friendly reminder: the road to environmental health is long and long.