The Environmental Protection Agency (EPA) enforced nearly $500,000 in fines and mandatory “environmental projects” on a school bus contractor for “excessive idling,” and as part of its anti-idling campaign to reduce the carbon footprint of school buses waiting to pick up children for their routes.

“As part of a settlement for alleged excessive diesel idling in Connecticut, Massachusetts and Rhode Island, Durham School Services will commit to reduce idling from its school bus fleet of 13,900 buses operating in 30 states,” read an EPA press release on Tuesday.