Setbacks for gas stations in a world with regionally varying emissions factors and acceptable health risks
Year: 2023
Type: article
Abstract: Motivation Gas stations chronically release gasoline vapor to the environment that contains the carcinogen benzene. However, there is no method for estimating setbacks for a gas station depending on an acceptable excess cancer risk due to the benzene emissions, sales volume, benzene content of the emissions, and inhalation dose, without performing an air dispersion simulation for each scenario. Methods We developed a new modeling framework, in which only one air dispersion simulation is performed for a reference gas station. Then, a new scaling law is used to estimate cancer risks and setbacks for different gas station characteristics and exposure scenarios. Results Our new scaling law allows estimating cancer risk vs. distance as a function of an acceptable excess cancer risk, total benzene emission rate, and frequency of exposure. Setbacks can also be determined from this scaling law or graphically from a design chart. Calculated setbacks differ only slightly from those determined from air dispersion simulations. Different emission control technologies substantially affect calculated setbacks. Conclusions We developed a framework that allows policy makers to examine easily how setbacks depend on regulatable measures such as emission control and acceptable cancer risk as well as on exposure characteristics. The framework also allows incorporating a safety factor to account for increased emissions. While this study was conducted in the context of US gas stations, our framework can be applied world-wide.
Author: Markus Hilpert
Institution: Columbia University
Language: English
Subfield: Health, Toxicology and Mutagenesis
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,125
OpenAlex ID: W4381930785