The Wyoming Department of Environmental Quality has been running an Engine Emissions Study for almost two years now. For the most part, Wyoming oil and gas fields are not connected to the grid and so they end up running on engines, which emit pollutants into the air. The study set out to evaluate emissions from these generators around the state. Results from the study show that a large percentage of the engines fail the tests. Wyoming Public Radio’s Irina Zhorov spoke with the DEQ Air Quality Engineer in charge of the study, Jon Walker, about why that is.