Views:11 Author:China Xicheng Publish Time: 2021-04-08 Origin:China Xicheng
Air pollution is currently one of the most important environmental pollution. The main causes of operational air pollution are industrial production, automobile exhaust, coal combustion, and material combustion. For example, the pollutants emitted by automobiles are mainly carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO), etc., as well as particulate pollutants (or particulate pollutants). Many air quality monitoring points in large cities have become The primary pollutant that influences the air pollution index.
Air pollution is divided into industrial pollution 25%, secondary inorganic aerosol 26%, automobile exhaust and garbage incineration 4%, biomass burning 12%, coal burning 18% and soil dust 15%.
In the past 100 years, the greenhouse effect has become a major scourge for mankind. Melting glaciers, rising sea levels, El Niño, and La Niña have all brought extremely severe challenges to human survival. And carbon dioxide is the main culprit leading to the greenhouse effect.
How to reduce air pollution?
1. Reduce the use of heavily polluting materials and use new clean energy.
2. Increase the green area and reduce deforestation.
3. Fully recycle recyclable garbage and reduce garbage incineration.
4. Develop new energy and promote the use of solar, wind and new energy
5. Industrial waste gas uses waste gas purification equipment (for example: wet scrubber) to control waste gas emissions.
6. Enhance personal environmental awareness.
7. Intensify the treatment of pollution sources, and restrict heavy pollution industries through legal means.
8. Invest more environmental protection funds for governance and prevention work.
Hydrocarbons: It is still unclear about its direct harm to human health. However, when nitrogen oxides and hydrocarbons are exposed to the sun's ultraviolet rays, they will produce an irritating light blue smoke, which contains ozone, aldehydes, nitrates and other complex compounds.
The most prominent hazard of this photochemical smog to the human body is to irritate the eyes and upper respiratory tract mucosa, causing eye redness and laryngitis. Photochemical smog occurred in London in December 1952. The number of deaths in 4 days was 4,000 more than that of the same period in normal years. The deaths were the most among those over 45 years old, which was about three times the normal rate; those under 1 year old were twice the normal rate.
Lead: Lead is a toxic heavy metal element. Most automobile oils are mixed with anti-explosive tetraethyl lead or methyl lead. Lead and its compounds formed after combustion are all toxic substances.
More than 60% of the lead in the urban atmosphere comes from the combustion of leaded gasoline in automobiles. Excessive lead content in the human body can cause cardiovascular diseases and affect the functions of vital organs such as the liver and kidneys and the nervous system. Due to the high proportion of lead dust, it usually accumulates in the air at a height of about 1 meter, so it poses the greatest threat to children.