Air quality PM2 5 standard, what is the PM2 5 air quality standard?

China's standard is an annual average concentration limit of 35 micrograms, and a 24-hour average concentration limit of 75 microgram cubic meters. It refers to particulate matter in the atmosphere with an aerodynamic equivalent diameter of less than or equal to microns, also known as particulate matter that can enter the lungs (there is no standard Chinese name).

Air quality grade 24-hour average standard value:

Excellent: 0 35 g m3

Good: 35-75 g m3

Light contamination: 75 115 g m3

Moderate pollution: 115 150 g m3

Heavy pollution: 150 250 g m3

Severe pollution greater than: 250 g m3 and above.

The air quality standard is a 24-hour average concentration of less than 75 micrograms cubic meters.

According to the World Health Organization (WHO), the standard value is less than 10 micrograms per cubic meter. When the average annual disturbance concentration reaches 35 micrograms per cubic meter, the chance of illness and death will be greatly increased. According to the WHO data, the international standards are the guideline value, which is less than 25 micrograms in 24 hours; Transition period target 1, less than 75 micrograms in 24 hours; Excessive target 2, less than 50 mcg in 24 hours; Over its target of 3, 24 hours less than a microgram of Tsai Li Xian.

1. According to the new air quality standard of the detection network, the distribution of the 24-hour average standard value is as follows:

1. Excellent -0 35 g m, good -35 75 g m.

2. Mild pollution -75 115 g m, moderate pollution -115 150 g m.

3. Severe pollution is -150 250 g m, and severe pollution is greater than -250 g m and above.

2. Index Standards:

1. The standard of fine particulate matter was proposed by the United States in 1997, mainly to more effectively monitor the fine particulate matter that appeared with the increasing development of industrialization and was ignored in the old standard. The fine particulate matter index has become an important indicator for measuring and controlling air pollution levels.

2. By the end of 2010, except for the United States and some countries in the European Union that included fine particulate matter in the national standard and imposed mandatory restrictions, most countries in the world have not carried out the monitoring of fine particulate matter, and most of them use PM10 monitoring.

Main hazards: 1. Although fine particulate matter is only a small component of the earth's atmospheric composition, it has an important impact on air quality and visibility. Compared with coarser atmospheric particulate matter, fine particulate matter has a small particle size, is rich in a large number of toxic and harmful substances, and has a long residence time in the atmosphere and a long transportation distance.

2. Therefore, it has a greater impact on human health and atmospheric environmental quality. Studies have shown that the smaller the particles, the greater the harm to human health. Fine particulate matter can drift to a greater distance, so it has a large area of influence.

3. Fine particulate matter is more harmful to human health, because the smaller the diameter, the deeper the part that enters the respiratory tract. Particulate matter with a diameter of 10 m is usually deposited in the upper respiratory tract, and particles below 2 m can penetrate deep into the bronchioles and alveoli. After fine particulate matter enters the alveoli of the human body, it directly affects the ventilation function of the lungs, making the body easy to be in a state of hypoxia.

In recent years, the problem of air quality has frequently caused people to worry, although there is no evidence that the explosion of the table, whether it causes difficult diseases for human health, but it will inevitably have an impact on the respiratory tract, and to a certain extent, it will affect people's work and life, so the issue of environmental governance is also a common concern of people, but whether we really know the standard of air quality PM25, let's take a look.

50-100；Light pollution: 100-150; Moderate pollution: 150-200; Heavy Pollution:

200-300；Severe pollution: greater than 300 and above. It's just that this value is only in China to meet the standard, but if compared with the international standards set by the state, there is a certain discrepancy, and it only meets the widest standard set by the WHO.

It is reported that the World Health Organization believes that the standard value is less than 10 micrograms per cubic meter. Average annual concentrations of 35 micrograms per cubic meter increase the chance of death from illness. Of course, this is mainly converted from sulfur and nitrogen oxides, which is similar to the product of coal combustion, but for developing countries, coal combustion is the main way of energy.

Coping methods:

1.When the air quality is poor, it is not advisable to open windows for ventilation, especially if you are suffering from respiratory diseases, try not to go out.

2.When you go out, you need to wear a professional dust mask, and only a professional mask can filter out fine particles, and the general medical mask has no obvious anti-effect effect.

3.Drink more tung bellflower tea, tung ginseng covered section tea, tung bellflower granules, bellflower soup, etc., this kind of tea with the effect of "clearing the lungs and removing dust".