The Industrial Revolution changed society in that it created a lot of pollution, especially air pollution from the burning of coal. Although medieval London had filthy streets, at least the air quality was good. After the Industrial Revolution, air quality worsened and people started to complain of more respiratory ailments. Another thing that changed was the manner in which entire families went to work. Factories often hired men, women, and children. The women and children were paid less because they were thought to need less money because they were not the "breadwinner" of a family. This disrupted the traditional family dynamic in working-class families of mothers who stayed at home and children who helped with home chores. Another change after the Industrial Revolution would be consumer habits. Mass-produced goods were often cheaply made and readily disposed of for new goods. This contrasts with the days of the artisans and professionals who often made consumer goods before the Industrial Revolution.