Minn. Stat. § 123B.885: DIESEL SCHOOL BUSES; OPERATION OF ENGINE; PARKING.

Subdivision 1. Operation of engine.

All operators of diesel school buses must minimize, to the extent practical, the idling of school bus engines and exposure of children to diesel exhaust fumes.

Subd. 2. Parking.

On and after July 1, 2003, diesel school buses must be parked and loaded at sufficient distance from school air-intake systems to avoid diesel fumes from being drawn into the systems, unless, in the judgment of the school board, alternative locations block traffic, impair student safety, or are not cost effective.