"Use of clean fuels and updated pollution control measures in the school buses 25 million children ride every day could result in 14 million fewer absences from school a year, based on a new study."
University of Michigan. (2015, April 23). Reducing school bus pollution improves children's health. ScienceDaily. Retrieved April 23, 2015 from www.sciencedaily.com/releases/2015/04/150423124822.htm
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