Gas and diesel-powered engine emissions are a significant source of pollution at school buildings. Throughout the school day, schools buses, cars, delivery trucks, and grounds equipment emit air toxins and fine particulates that significantly affect indoor air quality.

According to the District Department of Environment, the single largest source of pollution in DC is vehicle exhaust. Not only does vehicle exhaust pollute the environment and contribute to the formation of smog, acid rain  and carbon monoxide build up, but it has serious negative respiratory health effects.