Aren’t new diesel buses as clean as natural gas?
A. New emissions control devices for diesel engines can reduce pollutant emissions significantly. One diesel school bus manufacturer has installed pollution control equipment that “traps” toxic soot, cutting emissions by over 85 percent in certification tests. Particulate traps and other diesel pollution controls will only function if the engines are run on low-sulfur fuel, which will not be nationally accessible until required by federal law in 2006. Plus, these new pollution control technologies have not yet proven effective over the range of real-world operating conditions. If they fail, degrade, or are disengaged, diesel buses will continue to pollute the air with black toxic soot and smog-forming emissions. While diesel cleanup technologies show promise, natural gas engines remain the cleanest alternative available today across the country. And, natural gas engines are already becoming even cleaner by adopting additional pollution controls.(2)(3) The following 2 questions are take
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- Aren’t new diesel buses as clean as natural gas?
