What is the haze index? What does the haze index mean?

Haze is a livelihood issue in very relationship. Haze weather is very harmful to human body. Unlike the fog in the morning, the appearance of smog indicates many environmental problems and is a bad situation for the environment. There are many reasons for smog. Some people may have heard of the smog index, but they don't know what it means. Here is an introduction.

1. What is the smog index?

The smog index is actually the so-called air quality index, which is a dimensionless index to describe the low-energy bleak control. For a single pollutant, there is an air quality sub-index, and the pollutants involved in air quality assessment include fine particles, inhalable particles, sulfur dioxide, nitrogen dioxide, ozone and carbon monoxide. Haze index mainly refers to the comprehensive evaluation of sulfur dioxide, inhalable particulate matter and single nitrogen oxide.

2. How normal is the smog index?

Haze index evaluation is divided into 6 grades.

Grade I: the air pollution index is 0-50, and the air quality is excellent.

Grade II: the air pollution index is 5 1- 100, and the air quality is good.

Grade III: the air pollution index is 10 1- 150, and the air quality is slightly polluted.

Level 4: air pollution index 15 1-200, with moderate air pollution.

Grade 5: air pollution index 20 1-300, with heavy air pollution.

Level 6: the air pollution index is greater than 300, and the air quality is seriously polluted.

3. The significance of smog index.

Grade I: The air quality is satisfactory, there is basically no air pollution, and all kinds of people can move normally.

Grade II: The air quality is acceptable, but some pollutants may have a slight impact on the health of a very small number of extremely sensitive people. It is suggested that a very small number of extremely sensitive people reduce outdoor activities.

Grade III: The symptoms of susceptible people are slightly aggravated, and healthy people have irritating symptoms. It is suggested that children, the elderly and patients with heart disease and respiratory diseases should reduce long-term and high-intensity outdoor sports.

Level 4: further aggravate the symptoms of susceptible people, which may have an impact on the heart and respiratory system of healthy people. It is suggested that patients with diseases should avoid long-term high-intensity outdoor exercise, and the general population should moderately reduce outdoor exercise.

Grade 5: The symptoms of patients with heart disease and lung disease are obviously aggravated, and the exercise tolerance is reduced, which is a common symptom of healthy people. It is suggested that children, the elderly and patients with heart disease and lung disease stay indoors and stop outdoor sports, and the general population should reduce outdoor sports.

Grade 6: the exercise tolerance of healthy people is reduced, the symptoms are obviously strong, and some diseases appear in advance. It is suggested that children, the elderly and patients should stay indoors as much as possible to avoid physical exertion, and the general population should try to avoid outdoor activities.

4. Smoke protection measures

Old people: In foggy weather, old people must stay at home, exercise indoors and avoid going out to exercise. Cooking at home is mainly cooking, reducing the generation of oil fume such as frying.

Children: Children's physical development is not complete, and smog is more harmful. In foggy days, children should avoid going out, learn more about smog and strengthen their awareness of self-protection.

Pregnant women: pregnant women must not go out in foggy days, so they should rest at home and pay attention to supplementing the relative humidity at home.

Outdoor activists: People who work outdoors need to pay attention to wearing masks when going out, and wear gas masks when necessary, especially traffic police, sanitation workers and construction workers.

5. What are the hazards of smog?

First, induce respiratory diseases. The composition of smog is very complicated, and there are hundreds of kinds of particles. These particles enter the respiratory tract through human breath, which will cause respiratory diseases such as bronchitis and asthma.

The second is to cause cardiovascular and cerebrovascular diseases. Hazy weather, low oxygen content in the air, will make the heart beat faster and make people feel chest tightness and shortness of breath. Especially the elderly.

Third, it causes various bacterial diseases. Because of the foggy weather, the sun can't shine on the earth, or the sun is weak. This will cause bacteria, viruses and microorganisms on the ground to multiply rapidly, causing diseases such as allergies.

Fourth, the risk of cancer increases. As we all know, smokers are 60% more likely to get lung cancer than ordinary people, and smog contains more harmful particles, so smog is more likely to cause cancer than smoking.

Fifth, it makes people feel depressed and irritable. People's mood is easily influenced by the weather. Haze The weather is gloomy and the air is dirty. People's mood will also become depressed and irritable. Lack of courage in doing things.

Sixth, traffic accidents are prone to occur. Hazy weather will reduce visibility, only a few meters can be seen clearly. It is very dangerous for pedestrians and vehicles on the road.