New Jersey's economy relies primarily on its manufacturing and pharmaceutical industry and the provision of transportation services. It is one of the most industrialized states in the country. Products made in the state, as well as other products produced in neighboring states, are exported by ports along the Hudson and Delaware rivers. New Jersey is also one of the nation's leaders in chemical agent production. For the year 2017 it was the second richest state in the country in average income per household. As one of the most populous states in the country, IRIS is essential to maintain the quality of the air, making the population enjoy the city with a good quality of life.