Here, we use InMAP to provide scoping-level answers to the two questions above for 96 global cities. Specifically, we estimate the contribution of 12 emission source sectors, both within and outside of the city boundaries, for primary (i.e., directly emitted) and secondary (i.e., formed in the atmosphere from primary emissions of gaseous pollutants) PM2.5. We additionally provide an evaluation of model performance in these urban areas and discuss opportunities for future improvements in model accuracy. For many of the cities we study, information provided herein is the only quantitative information that exists regarding the within-city vs. out-of-city contribution of ambient PM2.5. Results reported here provide both information for stakeholders and an analysis of opportunities to improve their accuracy in future work.