As cities grow, the negative effects of congestion start to play their part, often affecting the cities' ability to become and remain competitive. Although many studies have focused on these negative effects, the links between pollution and city competitiveness are less explored. This paper focuses on this relationship, particularly the links between air pollution and city growth, and how it correlates with city competitiveness. Although high-income cities are usually better at managing pollution, the paper finds successful examples of fast-growing, lower-income cities that are able to tackle this issue. The evidence shows that cities can be competitive and still manage pollution, as long as they have a proactive attitude and focus on developing a green agenda to support this journey.