I. Policy Guidance and Legal Norms

In recent years, many countries and regions have issued a series of strict laws and regulations aimed at reducing pollutant emissions and improving air quality standards. For example, China has implemented the strictest Law on the Prevention and Control of Air Pollution in history, which clarifies the responsibilities of governments at all levels to prevent and control air pollution; The European Union is committed to significantly reducing the level of major air pollutants by 2030 by formulating the "Clean Air Plan". These policies not only provide a strong institutional guarantee for air pollution control, but also promote the technological progress and service optimization of related industries.

Second, scientific and technological innovation leads change

　　Science and technology is the key to solving environmental problems. With the application of advanced technologies such as nano-materials and biological filtration, new high-efficiency air purification equipment is constantly emerging. For example, HEPA filter combined with activated carbon adsorption technology can effectively remove many harmful substances such as PM2.5 and formaldehyde. In addition, with the development of information technology such as the Internet of Things and big data analysis, intelligent monitoring systems have been widely used, realizing real-time monitoring and early warning of indoor and outdoor air quality and helping people to take protective measures in time.

Third, green lifestyle advocacy

In addition to relying on technology and policies, changing personal behavior is also an indispensable part of improving air quality. More and more people are beginning to realize the importance of consuming resources in their daily life for environmental protection, and choose low-carbon travel, reduce the use of disposable plastic products, actively participate in afforestation and other activities to jointly create a good ecological environment. At the same time, all walks of life have extensively carried out publicity and education activities to enhance citizens' awareness of environmental protection and form a good atmosphere for the whole society to pay attention to and support environmental protection.

Iv. international cooperation to overcome the difficulties

Air pollution is a global problem, which requires the joint efforts of the international community to achieve results. Governments of all countries should strengthen exchanges and cooperation, give each other assistance in financial support and experience sharing, and jointly carry out cross-border air pollution prevention and control projects. For example, the Paris Agreement emphasizes the importance of controlling greenhouse gas emissions to cope with climate change, which indirectly promotes the improvement of air quality.

In short, with the increasing awareness of environmental protection today, all parties are making contributions to air purification from the government level to the non-governmental forces. In the future, we have reason to believe that a fresher and more pleasant living environment can be achieved through continuous efforts.