This research paper investigates the impact of air pollution and happiness among residents in Delhi, India. Delhi is one of the most polluted cities in the world, and its citizens face severe health hazards due to air pollution. While previous studies have focused on the adverse health effects of air pollution, the present study investigates its impact on subjective well-being, i.e., happiness. Using data from a survey conducted among a sample of Delhi residents, this study examines the relationship between various indicators of air pollution and self-reported levels of happiness. The results suggest a significant negative relationship between air pollution and happiness, with higher levels of pollution associated with lower levels of happiness. The study also identifies some of the key factors that moderate this relationship, such as socio-demographic variables, perception of health risks, and coping strategies. The findings of this study have important implications for policymakers, urban planners, and public health officials, who must consider the impact of air pollution on subjective well-being while formulating policies and interventions to address this critical issue.