Haze's Harm to Nature

Haze is harmful to nature. Fog is actually a non-toxic and harmless natural phenomenon, but smog is not necessarily. Its formation is mainly the result of the interaction between a large number of suspended particles in the air and meteorological conditions. Understand the harm of smog to nature.

The harm of smog to nature is 1 1, and the phenomenon of static wind in the horizontal direction increases.

2. There is an inversion in the vertical direction.

3. The increase of suspended particles in the air.

With the growth of urban population and industrial development, the number of motor vehicles has soared, and the emissions of pollutants and suspended solids have increased greatly, which directly leads to the decline of visibility. In fact, dust "smog" will also occur in home decoration, and indoor dust is pervasive, which is not only harmful to the health of staff and users, but also increases the cleaning burden. When the dust is serious, it will also bring many hidden dangers to the decoration project.

In addition to meteorological conditions, the increase of atmospheric particulate matter (including coarse particulate matter PM 10 and fine particulate matter PM2.5) caused by industrial production, vehicle exhaust emissions and coal burning in winter is an important factor of smog. At present, the level of pollutant discharge in many cities is at a critical point, which is very sensitive to meteorological conditions. When diffusion conditions are good, the air quality can reach the standard, and once adverse weather conditions are encountered, the air quality and visibility will drop rapidly.

What are the hazards of smog?

First, the harm of smog to people

1, lung injury

Smog weather has the greatest impact on the respiratory system, which has become the common sense of most people. The respiratory system has the most frequent contact with the external environment and the contact area is large. Hundreds of atmospheric particles can directly enter and adhere to the upper and lower respiratory tract and lungs of the human body, most of which will be inhaled by the human body. Secondly, the haze weather weakens the surface ultraviolet rays, which easily increases the activity of bacteria in the air. Fine particles can "carry" bacteria and viruses deep into the respiratory system, causing infection.

2. Hurt my heart

Harvard University School of Public Health has proved that particulate pollutants on cloudy days will not only cause myocardial infarction, but also cause myocardial ischemia or injury. The United States investigated 25,000 people with heart disease or bad heart, and found that with the increase of PM2.5, the mortality rate of patients would increase 10 μ g/m3.

Step 3 damage blood vessels

There are many pollutants in the air in foggy days, and the air pressure is low, which is easy to induce acute attacks of cardiovascular diseases. When the fog is heavy, the water vapor content is high. When people exercise outdoors, sweat is not easy to be discharged, which makes people feel chest tightness and blood pressure rise.

Moreover, in foggy weather, the air pressure is relatively low, and people will feel irritable and their blood pressure will naturally rise. In addition, in foggy days, the temperature is often low. Some patients with hypertension and coronary heart disease suddenly go from warm indoor to cold outdoor, and blood vessels expand with heat and contract with cold, which will also increase blood pressure, leading to stroke and myocardial infarction.

4, hurt the skin

Skin also has respiratory function. In clean air, the skin will be very comfortable and moist, but in a dirty environment, the skin will be very uncomfortable.

5. Brain injury

Smog not only harms organs, but also affects the nervous system invisibly. Zhong Nanshan once introduced that the 65th annual meeting of the American Geriatrics Association came to a conclusion that if PM2.5 in the air increases 10 μ g/m3, people's brain function will age for three years.

Second, the harm of smog to the environment

1, affecting traffic

Due to poor air quality and low visibility in foggy days, rear-end collision accidents are prone to occur, which will affect the normal traffic order and have no change in everyone's travel. We should observe the road conditions more during daily driving to avoid danger.

2. Affect life

Haze weather has an important impact on roads, railways, aviation, shipping, power supply systems and crop growth. Fog and haze will cause air quality decline, affect the ecological environment and bring great harm to human health.

Haze's harm to nature 2 Haze's harm

1, affecting respiratory system

The composition of smog is very complex, including hundreds of atmospheric chemical particles. Among them, aerosol particles smaller than 10 micron are harmful to health, such as mineral particles, sea salt, sulfate, nitrate, organic aerosol particles, fuel, automobile exhaust, etc., which can directly enter and adhere to human respiratory tract and alveoli.

In particular, submicron particles will be deposited in the upper and lower respiratory tract and alveoli respectively, causing acute rhinitis and acute bronchitis. For patients with chronic respiratory diseases such as bronchial asthma, chronic bronchitis, obstructive emphysema, and chronic obstructive pulmonary disease, smog weather will make the condition acute or acute. Staying in this environment for a long time will also induce lung cancer.

2, affect the cardiovascular system

Haze weather also has a serious impact on cardiovascular and cerebrovascular diseases, which will hinder normal blood circulation, lead to cardiovascular diseases, hypertension, coronary heart disease, cerebral hemorrhage, and may also induce angina pectoris, myocardial infarction and heart failure. In addition, when the fog weather pressure is relatively low, people will feel irritable and their blood pressure will naturally rise.

On the other hand, in foggy days, the temperature is often low. Some patients with hypertension and coronary heart disease suddenly go from warm indoor to cold outdoor, and blood vessels expand with heat and contract with cold, which will also increase blood pressure, leading to stroke and myocardial infarction. Therefore, patients with cardiovascular and cerebrovascular diseases must take medicine on time and handle it carefully.

3, affect the reproductive system

Heavy metals, polycyclic aromatic hydrocarbons and other harmful substances are attached to the smog, which can easily lead to fetal growth retardation and low birth weight infants. Toxic substances can skip the placenta and directly affect the fetus, especially in the early pregnancy.

4. Affect the healthy growth of children.

Hazy weather can also lead to the weakening of ultraviolet rays on the surface. In foggy days, due to the decrease of sunshine, insufficient ultraviolet radiation for children, insufficient production of vitamin D in the body, and greatly reduced absorption of calcium, rickets in infants and young children will be seriously caused, which will slow down the growth and development of children. If possible, you can use the negative ion dimension C machine and open the window less in foggy days.

Children's respiratory immunity is lower than that of adults. Once the harmful and toxic substances contained in smog are inhaled by children, they will stimulate his respiratory mucosa and cause various diseases of the respiratory system. In addition, with the warmer weather this winter, all kinds of bacteria and viruses are extremely active, and with the inhalable particles in the air entering the lungs, some related diseases will also be induced, mainly respiratory infections and allergic diseases.

5, affect mental health

Experts point out that continuous foggy days have an impact on people's psychology and body. Psychologically speaking, foggy days will give people a feeling of depression, which will stimulate or aggravate the state of psychological depression. In addition, due to the weak light and low air pressure in foggy days, some people will feel lazy and depressed in foggy days.

6, affecting traffic safety

In foggy weather, the visibility of the visual field is low and the air quality is poor, which is easy to cause traffic jams and traffic accidents.

Haze's Harm to Nature Three Main Sources of Haze

human factor

Sources of toxic particles in cities:

First: it's automobile exhaust. Large vehicles that use diesel are "recidivists" who emit PM 10, including buses, shuttle buses of various units and large transport trucks. Sources of toxic particulate matter in cities: firstly, automobile exhaust. Cars that use diesel are "habitual criminals" who emit particles. Small cars that use gasoline emit gaseous pollutants, such as nitrogen oxides, which are easily converted into secondary particulate pollutants in foggy days, aggravating smog.

Vehicle exhaust is the main component of smog particles. According to the latest data, motor vehicle exhaust accounts for 22.2%, coal combustion accounts for 16.7%, dust accounts for 16.3%, and industry accounts for 15.7%. However, with the development of automobile technology and the improvement of oil quality, environmental managers have found that motor vehicle exhaust does not play a decisive role in the formation of haze weather. However, as some cities with large car ownership, managers still need to control vehicle emission standards to avoid the formation of haze weather.

Second: the waste gas produced by burning coal for heating in winter in the north.

Third: the waste gas emitted by industrial production. For example, metallurgy, kilns and boilers, electromechanical manufacturing, automobile repair and paint and building materials production produce a lot of waste gas from kiln combustion.

Fourth: Dust generated by construction sites and road traffic.

Fifth, particles can grow. The particle size of bacteria and viruses is equivalent to PM 0. 1 ~ PM 2.5. When the humidity and temperature in the air are appropriate, microorganisms will attach to particles, especially oil fume particles. After absorbing oil droplets, microorganisms will be transformed into more microorganisms, which will increase the number of biological toxic substances in smog.

6. Dust "smog" will also be produced in home decoration. Indoor dust is pervasive, which is not only harmful to the health of staff and users, but also increases the cleaning burden. When the dust is serious, it also brings many hidden dangers to the decoration project.

In addition to meteorological conditions, the increase of atmospheric particulate matter (including coarse particulate matter PM 10 and fine particulate matter PM2.5) caused by industrial production, vehicle exhaust emissions and coal burning in winter is an important factor of smog. At present, the level of pollutant discharge in many cities is at a critical point, which is very sensitive to meteorological conditions. When the diffusion conditions are good, the air quality can reach the standard, and once adverse weather conditions are encountered, the air quality and visibility will drop immediately.

climatic factor

"There is a difference between fog and haze. Fog refers to the weather phenomenon that the visibility is lower than 1 km due to the condensation of suspended water vapor in the atmosphere; The formation of smog is mainly the result of a large number of suspended particles in the air and meteorological conditions. There are three reasons:

First, the phenomenon of static wind in the horizontal direction has increased.

The higher the buildings are built in the city, the obstruction and friction of airflow passing through the urban area will be obviously weakened. The increase of static wind phenomenon is not conducive to the diffusion and dilution of suspended particles in the atmosphere, and it is easy to accumulate around urban areas and suburbs.

Second, the vertical direction is reversed.

The inversion layer is like a pot cover over a city. This inversion phenomenon that the upper air temperature is higher than the lower air temperature limits the vertical movement of the lower air, making it difficult for suspended particles in the air to drift to the upper air and be blocked at the lower air and near the ground.

Third, the increase of suspended particulate matter and organic pollutants in the air. With the growth of urban population and industrial development, the number of motor vehicles has surged, resulting in a large increase in pollutant emissions and suspended solids.