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The issue of cumulative impacts (CI) has been a central focus of the environmental justice (EJ) movement for decades. Understanding cumulative impacts requires consideration of the complex interplay between socio-demographic, environmental, and public health factors that impact EJ communities. These communities are both more likely to be overburdened with pollution (higher vulnerability) and more likely to suffer severe impacts from pollution (higher susceptibility) . Yet advancing actions that address cumulative impacts in EJ communities has been challenging for a variety of reasons. One of the key barriers to addressing CI in environmental decision-making is the narrow focus of existing environmental regulations that do not include an explicit mandate to consider multiple pollutants from multiple sources. There are gaps in our knowledge about how multiple pollutants interact with each other and impact public health under different conditions; and most environmental laws do not consider the socio-demographic and health disparities that impact EJ communities . Finally, one of the biggest obstacles to implementing a proactive approach to addressing CI has been the lack of political will to limit the activity of industry in EJ communities where cumulative impacts have traditionally been concentrated…