Healthy School Bus Act of 2006 - Directs the Administrator of the Environmental Protection Agency (EPA) to study air quality inside school buses and develop strategies for improving such air quality.
Authorizes appropriations for activities to improve air quality inside school buses, including expansion of the Clean School Bus USA program.
Expresses the sense of Congress that schools should assign school buses that pollute less to the longest routes and adopt and implement policies to decrease school bus idling.