Sources of diesel emissions in OregonThe most significant sources of diesel exhaust in Oregon are on road heavy duty diesel and diesel construction equipment. These sources are identified among the sources creating the most public health risk from air toxic exposure in the Portland Air Toxics Study.

Other diesel engines also contribute, such as those used in locomotives and in marine vessels.

That’s why DEQ formed Oregon’s Clean Diesel Initiative to work with heavy-duty diesel owners and operators to take advantage of the benefits of diesel engines, while reducing their emissions. Retrofits, emission control devices, electrified truck stops and engine replacement are just a few of the strategies available. Many of the strategies not only decrease diesel exhaust but help Oregon businesses save fuel and operational costs.

To reduce diesel exhaust from construction equipment, DEQ also recommends consideration of the Clean Diesel Construction Pilot Credit issued by the US Green Building Council for all construction projects.