Experts: bioaerosols in PM2.5 are alive and threatening the human body.

category:Global
 Experts: bioaerosols in PM2.5 are alive and threatening the human body.


The professor of environmental science and engineering of Peking University, Peking University, said that bioaerosols usually refer to aerosols containing microorganisms or from biological substances within 100 microns, including bacteria, viruses, fungi and chemical toxins suspended in the air, which are important for atmospheric particulates such as PM2.5 and PM10. Componentu3002 Bioaerosols mainly come from the emission of soil, vegetation, water and other emissions, as well as animals, hospitals, farms, landfill sites and sewage treatment plants, including human beings. The bioaerosol particles from different sources and different sizes have different effects on peoples health due to their toxicity and different air suspension time. The typical particle sizes of pollen grains, fungi and bacteria are 15 - 58 micron, 1 - 30 micron and 0.25 - 8 microns, respectively, and the size of the virus is less than 0.3 microns. To be prosperous, respiratory exposure to bioaerosols can lead to various respiratory diseases such as lower respiratory tract infection, asthma and allergy. 50 million people worldwide, such as the outbreak of the H1N1 flu in 1918, are now the fourth largest killer of the lower respiratory tract caused by influenza virus, and nearly 3 million people are killed every year. PM2.5 is smaller and can be directly entered into alveoli, blood and so on, so it is considered to be more harmful. The biggest difference from chemical is that if the aerosol is inhaled, it can not only enter deeper, but also reproduce itself under certain conditions, because of this characteristic, the harm of specific biological aerosols is not threshold. Studies have shown that the common fungi of the genus Penicillium, Aspergillus, and spores in the air can secrete allergens and cause anaphylactic respiratory disease; research indicates that bioaerosol exposure can also promote a significant increase in blood pressure in healthy people, leading to irreversible chronic pulmonary dysfunction. The study also found that the concentration of biological aerosols in the air was significantly higher than that of non haze days at haze days, and the cities with serious pollution were significantly higher than those in the countryside. That is to say, these biological components in the haze time and space atmosphere further aggravate the health risks. The fastest 1 minutes become a huge challenge for monitoring and warning Due to these characteristics of bioaerosols, the treatment, analysis and protection measures in a particular place need to be completed in 3 - 5 minutes, and the optimal time for monitoring and warning is 1 minutes. To be prosperous, the requirement of this time is a great challenge to the existing technology. According to reports, in order to achieve biological warning, the United States cost nearly US $100 billion, specially set up the biological shield program. In the past 10 years, the biological aerosol Laboratory of Peking University has developed a special air biosafety defense system (BioSTAND), which integrates air, exhalation gas sampling, yeast protein fluorescence and other analytical techniques for the first time. For the first time, the fluorescent labeled yeast has been used to realize many aspects of the toxicity of fine bacteria and PM2.5 in real time. Line monitoring and so on. Human cells, like yeast cells, have autophagy, and the basic mechanisms are similar, and have similar reactions. The damage to the genes of the human gene can be deduced from the damage to the yeast gene by PM2.5 and so on. In the laboratory, the laboratory has screened hundreds of gene proteins from yeast and found that the oxidative damage protein (HSP60), DNA repair protein (SSA1) and so on are more sensitive to the response of PM2.5 in the air. When PM2.5 and other enzymes have some damage to the yeast, the corresponding green fluorescent protein (GFP) is expressed and luminescent, and then captured by the automatic detection platform of the yeast protein fluorescence, which is like real-time monitoring of the traffic congestion in each vehicle in different regions. To flourish. Setting up a toxic index system for air pollution At this seminar, many experts, such as Hou Lian, the Chinese peoples Liberation Armys rocket army, said that the prevention and control of air pollution is essentially to minimize the impact of air pollutants on human health. The existing air quality evaluation system is mainly based on the quality concentration and neglects the different particles. The difference, which includes active bioaerosols, will lead to a blind emission reduction of cost - free pollutants, but no additional health benefits. Therefore, it is necessary to establish an air pollution toxicity index system objectively. It also indicates that the interaction mechanism of bioaerosols and atmospheric chemical pollutants and the possible role in its transformation and the impact of the formation of clouds and climate change need to be further understood; whether biological aerosols are related to atmospheric pollution and haze formation mechanisms, and whether microorganisms in the atmosphere will be involved in redox. Reactions are all scientific questions that have never been explored and are worth studying. Source: ScienceDaily editor in charge: Zhang Haitong _NN9053 At this seminar, many experts, such as Hou Lian, the Chinese peoples Liberation Armys rocket army, said that the prevention and control of air pollution is essentially to minimize the impact of air pollutants on human health. The existing air quality evaluation system is mainly based on the quality concentration and neglects the different particles. The difference, which includes active bioaerosols, will lead to a blind emission reduction of cost - free pollutants, but no additional health benefits. Therefore, it is necessary to establish an air pollution toxicity index system objectively. It also indicates that the interaction mechanism of bioaerosols and atmospheric chemical pollutants and the possible role in its transformation and the impact of the formation of clouds and climate change need to be further understood; whether biological aerosols are related to atmospheric pollution and haze formation mechanisms, and whether microorganisms in the atmosphere will be involved in redox. Reactions are all scientific questions that have never been explored and are worth studying.