Now, it turns out, the lack of belts might not be the only danger in buses. The Associated Press reports that the engines in school buses are outdated and put out pollutants that can be up to five times filthier than the air outside.
Not much has been done to update school bus engines, even though the Congress committed $1 billion to help communities clean up bus fumes. Particulate filters, at $700 each, or an underhood filter system at $7500, would cure up to 90 percent of diesel emissions, the AP notes.
The clean diesels we’ll be driving in passenger cars next year are light-years better than bus diesels in terms of particulate emissions. But for passengers big and small on almost 100,000 school buses built before 1990, clean air is strictly optional.
Kids breathing pollutants on aging buses—Associated Press