Patchwork of land use, tapestry of risk

The links between built form and environmental health are, as yet, inadequately understood. Risk is a formless and ambiguous phenomenon tightly embedded in the myriad pattern of land uses that generate it. Our research, which is founded on a contextualist notion of policy design, demonstrates the potential of innovative land use policy instruments (i.e. form-based codes, conditional use permits) to address risk. We model environmental risks from point and mobile sources in Southeast Los Angeles (SELA), a known air toxics hotspot. We compare risk contours before and after implementation of land use interventions. The use of innovative form-based codes for modifying built environments results in appreciable risk reductions around transportation corridors in SELA. Conditional use permits employing technological standards for commercial and light-industrial land uses also produce some risk reductions. This research suggests an untapped potential for land use planning instruments to address the environmental health impacts of built form.