Let me ask you a question, why there are a lot of metal particles in the smog

Foliar dust has a wide distribution range and a long accumulation time, which can better indicate the characteristics and accumulation of atmospheric particulate matter pollution near the ground. In order to reveal the characteristics of atmospheric particulate matter pollution in urban road traffic, the foliar dust retention of Sophora japonica on both sides of different types of roads in Beijing was studied, the concentration and pollution characteristics of the main heavy metals in foliar dust were analyzed, and the correlation analysis and principal component analysis method were used to determine the main heavy metals of particulate matter. The results show that:

The ratio of foliar dust retention in expressway, trunk road, secondary trunk road and branch road was 100: 84: 75

75, which is greatly affected by traffic flow. The average foliar dust retention was g m2 for the street tree and g m2 for the garden tree (away from traffic). The concentrations of heavy metal elements Cu, Zn and Pb in leaf dust of street trees reached 6 times of the soil background value, and the spatial distribution was relatively uniform, mainly from traffic emissions, and the heavy metal pollution of garden dust was also significantly affected by traffic emissions.

Exhaust gases emitted from coal burning and automobiles contain many metal particles. There are a lot of metal particles in exhaust gas, and Beijing's pollutants are mainly exhaust gas and construction pollution, but these two are all economic lifelines, you see! Smog has a lot to do with car exhaust and construction pollution.

Isn't that air pollution everyone's responsibility?

The heavy metals in the atmosphere are mainly used in industrial production, automobile exhaust emissions and a large number of harmful gases and dusts containing heavy metals produced by automobile tire wear.

Particle: Solid, liquid, or solid and liquid particulate matter suspended in the air, such as dust, smoke, fog, and microorganisms.

Mist fog refers to tiny droplets suspended in the air. When the relative humidity reaches 100%, the water vapor in the air will condense into fine water droplets suspended in the air, reducing visibility at ground level, a weather phenomenon called fog.

Haze, also known as haze or haze, refers to the turbidity phenomenon formed by the suspension of a large amount of smoke, dust and other particles for unknown reasons. The core substance of haze is dust particles suspended in the air, which are meteorologically called aerosol particles. In recent years, the air quality has gradually deteriorated as the "haze" weather phenomenon has become more frequent.

The haze contains hundreds of atmospheric chemical particulate substances, which invade the human respiratory tract and lung lobes when people are unprepared, thus causing respiratory diseases, cardiovascular system diseases, blood systems, reproductive systems and other diseases, such as pharyngitis, emphysema, asthma, rhinitis, bronchitis and other inflammations, and long-term exposure to this environment will also induce lung cancer, myocardial ischemia and injury. Haze also often causes traffic accidents.

Therefore, in areas with high dust and frequent haze, in these environments, it is necessary to wear respiratory protective equipment, and masks are the first choice. But not all masks can be protected, because a lot of particles are relatively fine, and it is a high-concentration environment, so ordinary gauze masks and other conventional masks do not play much role, we must look for the national standard "GB2626-2006 respiratory protection equipment self-breathing anti-particulate matter respirator" KN90, KN95, KN100 level masks, in order to ensure effective filtration, to ensure our own health.

Haze weather. There are several reasons for this.

The atmospheric air pressure is low.

The main factor when the air is not moving. Due to the non-flow of air, tiny particles in the air accumulate and float in the air.

The ground is dusty and the air is humid.

Low, the ground of people and traffic churns up the dust.

Automobile exhaust is the main pollutant emission, and in recent years, there are more and more cars in the city, and the emission of automobile exhaust is a factor of smog.

Secondary pollution produced by the factory.

Pollutants such as CO2 emitted from heating in winter.

Haze particulate matter is, PM10 and so on, which can be searched on the web. The reason why PM10 and other particles really form haze is that the earth's magnetic field is weakened, PM10 and other particles have a positive charge, and the water vapor evaporated from the surface has a negative charge, and the particles such as PM10 combine with water vapor, and the particles increase, which is not conducive to the upward diffusion of particles. Of course, there are also meteorological reasons, which can be searched on the Internet.