I smell big rats here. A comment to the article:
Based on this article, this research was unfocused, at best. “Vehicle emissions” include hydrocarbons, particulate matter, nitrogen oxides, carbon monoxide, sulfur dioxide, benzene, acetaldehyde, and 1,3-butadiene. With the exception of CO, emissions of these components are generally higher from diesel than gasoline engines.
“Mice were exposed for a few hours, several days a week, to whole diesel exhaust at a particulate mass concentration within the range of what mine workers usually are exposed to.”
Extrapolating this to humans not working in mines, most of whom have minimal exposure to diesel exhaust in far lower concentrations, is a stretch.