With the acceleration of society, industrialization and urbanization, the problem of air pollution is becoming more and more serious, which poses a great threat to human health. According to the statistics of the World Health Organization, about 91% of the world's population lives in an environment where air quality does not meet safety standards, and the number of premature deaths caused by air pollution exceeds 7 million every year. Therefore, how to effectively purify the air and protect environmental health has become an urgent problem to be solved.

First, understand the air pollution sources

Knowing the main sources of air pollution is the premise of taking effective measures. Industrial emissions, automobile exhaust, construction dust, agricultural activities (such as burning straw) and household coal burning are all important factors that cause air pollution. In addition, natural factors, such as sandstorms, will also aggravate the degree of air pollution in some areas.

Second, the application of air purification technology

According to different pollutant types and concentration levels, scientists have developed a variety of air purification technologies:

Physical filtration: fine particles such as PM2.5 are removed by HEPA high-efficiency particle filter.

Chemical adsorption: using activated carbon or molecular sieve to adsorb harmful gases.

Photocatalytic oxidation: nano-TiO2 is used as catalyst to decompose organic pollutants under illumination.

Negative ion generator: release a large number of negative oxygen ions and settle with positive particles in the air to improve indoor air quality.

　　Third, personal protection and public participation

In addition to relying on scientific and technological progress, everyone should also enhance their awareness of self-protection, such as reducing their time out, especially in heavily polluted weather; Choose a green mode of travel and try to use public transport instead of private cars; Planting green plants to absorb carbon dioxide and release oxygen.

At the same time, the government should strengthen legislative supervision, limit the emissions of highly polluting enterprises, and encourage the development and application of clean energy; All walks of life need to work together to raise the awareness of environmental protection of the whole people and jointly create a cleaner and better living environment.

IV. Conclusion

Air purification is not only a necessary means to maintain personal health, but also a key link to promote sustainable development and build a beautiful China. In the face of severe environmental challenges, each of us should take action and start from ourselves to contribute to the realization of the dream of blue sky and white clouds. Let's work together to create a better tomorrow!