In the process of urbanisation, the lack of attention to environmental issues has led to air pollution becoming more and more serious, with more and more cities experiencing haze and even extreme weather phenomena, posing a huge threat to people's health. Although more and more countries are paying attention to the problem of urban air pollution, they are still not receiving good results. This paper analyses the causes of urban air pollution from the perspective of industrial structure, urbanisation and other aspects, and proposes some measures to solve the problem.