According to new report by U.S. EPA, clean diesel grants aimed at cleaning up old diesel engines have greatly improved public health by cutting harmful pollution that causes premature deaths, asthma attacks, and missed school and workdays. Funding from Diesel Emission Reduction Act program has helped clean up approximately 335,200 tons of NOx and 14,700 tons of particulate matter. It has also saved 450 million gallons of fuel and prevented 4.8 million tons of CO2 emissions.