It must be recognized that stakeholder collaboration will be required to address many of the research priorities outlined here, particularly those involving more granular investigations of emissions sources, causes, and mitigation. This includes public and private organizations that may be hesitant to exchange data and information, grant site access, and who may oppose public-facing dissemination of research findings. In some cases, negotiating agreements with stakeholders may consume valuable research time and stymie progress. Thus, successful strategies to engage and manage stakeholders are crucial to enable the research and maintain momentum. These efforts should parallel the development of independent urban research projects that can be completed quicker and with less potential for bias.