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Air pollution is harmful to human health. Membrane technology has gradually become the mainstream method for air purification because it is efficient, environmentally friendly, and energy-saving. Membranes can not only efficiently remove particulate matter (PM) through surface filtration but can also realize the synchronous removal of other gaseous pollutants such as volatile organic compounds (VOCs), NOx, and SO2. In this chapter, first, the source, types, and hazards of air pollutants are briefly introduced. Second, membranes suitable for air purification, such as silicon carbide (SiC) ceramic membranes, biaxial stretching polytetrafluoroethylene (PTFE) membranes, and electrospun nanofiber membranes, are introduced in detail. Finally, the application and filtration mechanism of membranes for PM purification are described, and the membranes for the integration of the separation of PM with the removal of VOCs, desulfurization, denitration, and antibiosis are summarized. The integrated purification of multi-component air pollutants is the development direction of functional membrane materials for air purification.

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