They lobbied locally and in Washington DC to mandate certain safety features such as airbags and seatbelts, both of which reduce injury in the event of an accident.[2][3] These campaigns also used a variety of public health intervention methods to spread awareness of motor vehicle safety.[2] In the states where interventions took place, seat belt usage skyrocketed.[2] Motor vehicles contribute greatly to aggregate emissions all over the globe, which can have serious negative impacts on the health of the population.[4] In the 1970s, the Nixon administration created the Environmental Protection Agency as well as passing the Clean Air Act.[4] Both of these measures not only helped to reduce the amount of harmful emissions being produced by motor vehicles in the US, but they also helped improve health measures.