Hanoi is one of the most polluted cities in Southeast Asia, with air pollution caused by vehicles, factories, and construction buildings. The loss of green areas, which help clean the atmosphere, intensifies the problems. Even though people know creating a green environment is essential, there hasn’t been much research on how the shortage of green spaces is affecting the atmosphere in Hanoi. Learning more about this issue can help city planners create better policies for urban development. The research essay will illustrate the link between limited green spaces and air pollution in Hanoi.