Before her two kids returned to school at the end of last summer, Lorena Osorio stood before the Westminster, Colorado, school board and gave heartfelt testimony about raising her asthmatic son, now a student at the local high school. “My son was only three years old when he first suffered from asthma,” she said. Like most kids, he rode a diesel school bus. Some afternoons he arrived home struggling to breathe.

In Colorado, more than 4,000 yellow school buses run on diesel. They carry 42 percent of the state’s school kids and spew out nearly 50,000 tons of greenhouse gas emissions a year. Each electric school bus can save districts nearly $2,000 a year in fuel and $4,400 a year in maintenance costs, according to a report by the Colorado Public Interest Research Group (CoPIRG) Foundation, Frontier Group and Environment Colorado.

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