One of the following statements about PM2 5 is incorrect .

Pick D.

The mistake is that "due to the small size of the particles, the effect on air visibility is relatively weak." "Concentrations that rise to a certain level can lead to reduced visibility and even affect everyday life. EG: Smog in Beijing. All other options are correct.

Fine particulate matter is also known as fine particles, fine particles, . Fine particulate matter refers to particulate matter in ambient air with an aerodynamic equivalent diameter of less than or equal to microns. It can be suspended in the air for a long time, and the higher its concentration in the air, the more serious the air pollution.

Although it is only a small component of the Earth's atmosphere, it has important implications for air quality and visibility.

Compared with coarser atmospheric particulate matter, it has a smaller particle size, a large area, strong activity, and is easy to attach toxic and harmful substances (such as heavy metals, microorganisms, etc.), and has a long residence time in the atmosphere and a long transportation distance, so it has a greater impact on human health and atmospheric environmental quality.

Major hazards. Although fine particulate matter is only a small component of the Earth's atmosphere, it has important implications for air quality and visibility, among other things. Compared with coarser atmospheric particulate matter, fine particulate matter has a smaller 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, so 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.

Fine particulate matter is more harmful to human health because the smaller the diameter, the deeper it 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.

a.Particles in the air with a diameter of microns, also known as "particulate matter that can enter the lungs".

b.The main source of the shed mold is dust, coal burning and motor vehicle pollution.

The particle size is small and rich in a large number of toxic and harmful substances.

d.The residence and dissipation time in Yamato liquid gas is short, the transportation distance is short, and it has little impact on human health and atmospheric environmental quality (correct answer).

Refers to particulate matter in the atmosphere with a diameter of less than or equal to microns.

The main generation is daily power generation, industrial production, automobile exhaust emissions, etc.

c.Most of these particulate matter contain toxic substances such as heavy metals.

d.Long-term exposure to the repellent wheel interferes with gas exchange in the lungs.

It is the main component in the formation of fog.

Correct answer: e

Answer]: a, b, c

Refers to particulate matter in the atmosphere with a diameter of less than or equal to the digging-out micron, also known as particulate matter that can enter the lungs. Its diameter is less than 1 20 of the thickness of a human hair. Although it is only a small component of the Earth's atmospheric composition, it has important implications for air quality and visibility tolerance to dispersion.

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Answer]: a, b, c

PM2 5 refers to particulate matter in the atmosphere with a diameter of less than or equal to 2 pins and 5 microns, also known as particulate matter that can enter the lungs. PM2 5 contains a large number of toxic and harmful substances, and has a long residence time in the atmosphere and a long transportation distance, so it has a great impact on human health and atmospheric environmental quality. PM2 5 particles are extremely fine and highly diffuse, so they are very affected by the weather.

In general, PM2 5 concentrations are higher when the weather is sunny and lower when it is windy and rainy. Therefore, ABC is chosen for this question.

Answer]: A, B, Curved Laughing Beam C

PM2 5 refers to particulate matter in the atmosphere with a diameter of less than or equal to 2 5 microns, also known as particulate matter that can enter the lungs, which seriously affects air quality and does not disappear with clear weather. Therefore, ABC is selected for burial and collapse.

Answer]: a, c, d

According to the newly revised "Environmental Air-Fuel Li Comp Gas Quality Standards", the monitoring requirements of the new standards should be implemented in stages: in 2012, key regions such as Beijing-Tianjin-Hebei, Yangtze River Delta, and Pearl River Delta, as well as municipalities and provincial capitals; In 2013, 113 key cities and national environmental protection model cities were selected for environmental disturbance protection: in 2015, all cities above the prefecture level; On January 1, 2016, the new standard was implemented nationwide.

Therefore, the answer to this question is ACD.

Answer]: a, b, c

PM2 5 is a particulate matter in the atmosphere with a diameter of less than or equal to 2 5 microns, also known as fine particulate matter. Its diameter is less than 1 20 of the thickness of a human hair. Although PM2 5 is only a very small component of the Earth's atmospheric composition, wax dust has a significant impact on air quality and visibility.

It is particulate matter with a diameter of less than or equal to that of a micro-denier in the air.

It can enter the upper respiratory tract and cause diseases such as asthma, bronchitis and cardiovascular disease.

It will cause air pollution.

d.It doesn't exist in nature, and the current one is caused by the burning of fuel by humans.

Correct answer: ABC