What causes haze

summary

My friends and I have been studying the haze weather in recent months, because the haze weather often happens in the place where we live, so we will be more concerned about the haze weather. These two days, we read in a newspaper that some experts believe that haze is caused by atmospheric pollution and dust, which leads to haze. However, the books of those disciplines say that it is caused by various factors that lead to the increase of atmospheric micro particles, which leads to haze. Let me introduce to you what causes haze.

What causes haze

Reason 1: haze weather has existed since ancient times. Human activities or natural phenomena such as slash and burn cultivation and volcanic eruption may cause haze weather. However, after human beings entered the era of fossil fuels, haze really threatened the living environment and health of human beings. The rapid industrialization and urbanization lead to the rapid consumption of energy, high concentration of population and destruction of ecological environment, all of which pave the way for the formation of haze weather.

The second reason: haze is mainly composed of sulfur dioxide, nitrogen oxides and inhalable particles, which are combined with fog to make the sky suddenly gloomy. The abbreviation of particulate matter is PM. Beijing monitors fine particulate matter (PM2.5), that is, pollutant particles with aerodynamic equivalent diameter less than or equal to 2.5 microns. The particle itself is not only a pollutant, but also a carrier of heavy metals, polycyclic aromatic hydrocarbons and other toxic substances.

The third reason: the source of urban toxic particles: first, automobile exhaust. Diesel vehicles are the "serious offenders" of fine particulate emissions. Although small cars using gasoline emit gaseous pollutants, such as nitrogen oxides, it is easy to turn into secondary particulate pollutants in foggy days, aggravating the haze.

matters needing attention

Haze weather will have a great impact on people's daily life, people will cause a variety of diseases to a large extent because of the haze weather, which needs people's special attention in daily life.