Extractive industries and segregative planning have long contoured the uneven effects of air pollution and other forms of socioenvironmental toxicity in Pittsburgh’s industrialized river corridors. This is especially so in the Monongahela Valley, where three legacy US Steel facilities continue to create intersecting and multigenerational harms, particularly for Black and low-income communities. Yet, these toxic systems have not gone unchallenged, and there is a long history of community action against environmental and social injustices. Anchored in a collaboration with North Braddock Residents For Our Future, a grassroots environmental justice organization, and General Sisters, a neighborhood initiative focused on food, healing, and repair, this project asks how spatial design pedagogy and research can engage in interpretive, collaborative, and community-centered approaches to weave together the complex histories, political ecologies, material effects, modes of resistance, and everyday experiences of toxic systems to help shape better worlds. Taking inspiration from Eve Tuck’s (2009) call for “desire” rather than “damage” centered research, the project aims to channel institutional resources and design skills to aid community actions for environmental and community health, while reframing what counts as spatial expertise by centering knowledge production grounded in local experiences, expertise, and visions. Working through the framework of a seminar and studio, in close collaboration with residents in Braddock and North Braddock PA, the project will engage methods of participatory qualitative research, field work, and spatial design to develop an Archive of Air testifying to the historically situated sociomaterial entanglements of air in the Mon Valley, a Clean Air Learning and Gathering Space in North Braddock, and an Atmospheric Justice Curriculum to reflect on our process and outline ethical principles for collaborative research and design.