Each person inhales about 654.38+00000 liters of air every day, and the dust entering the alveoli can be absorbed quickly, directly entering the blood circulation and distributed throughout the body, without detoxification of the liver. Secondly, it will damage the ability of hemoglobin to transport oxygen and make blood lose. It may have serious consequences for patients with anemia and blood circulation disorders. For example, it will aggravate respiratory diseases and even cause heart diseases such as congestive heart failure and coronary artery. In short, these particles can also enter the blood through bronchi and alveoli, and harmful gases and heavy metals are dissolved in the blood, which is more harmful to human health. The physiological structure of human body determines that it has no ability to filter and block pm2.5, but the harm of pm2.5 to human health has gradually exposed its horrible side with the progress of medical technology.
In EU countries, pm2.5 has reduced people's average life expectancy by 8.6 months. Pm2.5 can also be a carrier of viruses and bacteria, which is helpful for the spread of respiratory infectious diseases. At present, the major developed countries in the world and Japan, Thailand and India in Asia have listed pm2.5 in the air quality standard. The most tragic thing is that pm2.5 has not been included in China's ambient air quality index, so it has become the root cause of the direct conflict between the data of the US Embassy and the official government data.
The World Health Organization also pointed out in the 2005 edition of the Air Quality Guide that when the average annual concentration of pm2.5 reaches 35 μ g/m3, compared with the situation of 10 μ g/m3, the risk of human death will increase by about 15%. According to the report of the United Nations Environment Programme, if the concentration of pm2.5 per cubic meter increases by 20 mg, about 340,000 people will die in China and India every year.