The American Lung Association released its "State of the Air 2015" report in April, noting that cleaner diesel fleets are a key factor in reduction in particulate emission levels. The Diesel Technology Forum responded with a statement on the data from Executive Director Allen Schaeffer. According to a press release:
“Engine and equipment makers together with fuel refiners and emissions control technology companies have made significant investments to produce this new generation of clean diesel technology with near zero levels of emissions. It’s rewarding to see the benefits of this work reflected in the quality of our environment.
The diesel industry is continuing to build on these accomplishments and is increasingly focused on producing near zero emissions technology that also is more efficient and has lower greenhouse gas emissions as well.”