Is smog an ecological problem?

Is smog an ecological problem? In recent years, smog has become a significant symbol of the escalation of air pollution hazards in China. With the deterioration of air quality, smog weather appears in many places. Share with you whether smog is an ecological environment problem.

Is smog an ecological problem? 1 Fog or haze is a disastrous weather, which 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.

In smoggy weather, bacteria and viruses are often carried in the air, which easily leads to the spread of infectious diseases and many diseases.

Urban air pollutants are not easy to diffuse, which aggravates the toxicity of sulfur dioxide, carbon monoxide, nitrogen oxides and other substances and harms human health.

In foggy and hazy weather in winter, if the air pollution is serious, it may form poisonous fog such as smoke (fog) or black smoke, which seriously threatens people's life and health.

Is smog an ecological problem? Is smog a natural phenomenon or environmental pollution?

If fog simply refers to natural phenomena, and smog refers to a state caused by environmental pollution.

Haze, as its name implies, is fog and haze. But there is a big difference between fog and haze. The aerosol system composed of dust, sulfuric acid, nitric acid and other particles in the air causes visual impairment, which is called smog. Haze is haze.

Fog is an aerosol system consisting of a large number of tiny water droplets or ice crystals suspended in the air near the ground. It mostly occurs in autumn and winter (which is also one of the reasons for the large-scale haze weather in China in June 20 13), and it is the product of water vapor condensation (or condensation) in the near-surface air. The existence of fog will reduce air transparency and worsen visibility. If the horizontal visibility of the target drops below 1000 meters, the weather phenomenon of water vapor condensation (or condensation) suspended in the air near the ground is called fog.

Haze (mái), also known as haze (smog), dust, sulfuric acid, nitric acid, organic hydrocarbons and other particles in the air can also make the atmosphere turbid. The phenomenon that the horizontal visibility of the target is 1000 ~ 10000 meters is called light fog or mist.

When fog is formed, the atmospheric humidity should be saturated (if there are a large number of condensation nuclei, the relative humidity may not reach 100%, and saturation may occur). Because the light scattered by fog composed of liquid water or ice crystals has little to do with wavelength, the fog looks milky white or bluish white and gray.

Haze weather is a state of air pollution, and smog is a general term for all kinds of suspended particles in the atmosphere, especially PM2.5 (particles with aerodynamic equivalent diameter less than or equal to 2.5 microns) is considered as the "culprit" causing haze weather. With the deterioration of air quality, cloudy days are increasing and the harm is increasing. In many areas of our country, the smog weather phenomenon is combined with fog as an early warning and forecast of disastrous weather. Collectively referred to as "haze weather".

Is smog an ecological problem? 3 how is the smog produced?

From a professional point of view,' fog' and' haze' are actually different. 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.

The difference between smog and fog is that the relative humidity is not high when smog occurs, but the humidity in fog is saturated (if there are a lot of condensation nuclei, smog (PM2.5) is actually an aerosol and a colloid. Although its total mass is small, it is difficult to settle and has a great impact on people's health (like asbestos, it can cause cancer).

PM2.5 is not smoke from burning coal and straw, nor is it wind and dust. In fact, it is a kind of photochemical pollution, which is an oxide of sulfur and nitrogen after fuel combustion. Compounds formed by complex photochemical reactions.

Inhalable particles in smog will seriously affect human health, and then cause various respiratory diseases. In foggy days, no matter indoors or outdoors, strenuous physical activity and exercise should be avoided; If you have difficulty breathing or heart discomfort, you should seek medical advice in time; Try to avoid going out in the morning and evening, and avoid being close to the main traffic roads; Delaying activities that require a lot of physical strength and reducing physical activity can effectively prevent the harm caused by smog weather.

The smog problem shows the overall "overdraft" of global environment, resources, land and living consumption. At the same time, smog is not an isolated problem, which needs long-term efforts of systematization, systematization and normalization to solve. To control smog, the government and all the people need to take action, implement every detail of life, save resource consumption, and advocate a green and healthy life. This is the long-term policy.

Is smog an ecological problem? 4 What is smog?

Haze is a combination of fog and haze. Smog is very common in cities. In many areas of China, fog and haze are combined as disastrous weather phenomena for early warning and forecasting, which are collectively called "haze weather".

Haze is the result of interaction between specific climatic conditions and human activities. The economic and social activities of high-density population will inevitably emit a large number of fine particles (PM 2.5). Once the emission exceeds the atmospheric circulation capacity and carrying capacity, the concentration of fine particles will continue to accumulate. At this time, if it is affected by calm weather, it is easy to have a wide range of smog.

How is the smog formed?

There are many sources of smog, such as automobile exhaust, industrial emissions, building dust, garbage incineration, and even volcanic eruption. Hazy weather is usually formed by the mixed action of various pollution sources. However, in smog weather in different regions, different pollution sources have different functions.

Haze weather has existed since ancient times, and human activities or natural phenomena such as slash-and-burn and volcanic eruption may lead to haze weather. However, after mankind entered the era of fossil fuels, the smog weather really threatened the living environment and health of mankind. Rapid industrialization and urbanization lead to rapid energy consumption, high concentration of population and destruction of ecological environment, which have laid the groundwork for the formation of haze weather.

The formation of smog has both a "source" and an "accomplice", which is a meteorological condition that is not conducive to the spread of pollutants. Once pollutants accumulate for a long time under static meteorological conditions, it is easy to form haze weather. The formation of smoke has three elements:

The first is the physical basic source of particulate matter. China has the largest loess plateau in the world, and its soil texture is the easiest to produce granular dust particles.

Second, poor exercise leads to dust. For example, the mud in the garden in the middle of the road and the soil on the roadside stones will flow to the road after raining or splashing water, which will produce a lot of dust after one hour of drying. Even if these particles fall back to the ground, they will be thrown over the city again because of the continuous passing of cars.

Thirdly, the basic source of dust and the process of movement difference gather in a certain spatial range, and particles finally gather with water molecules to form haze. At present, in more than 350 cities in the Loess Plateau of China, the three elements of smog structure are quite rich.