'Health costs of air pollution'; second challenge.
D000397:Air Pollution / Q000191:economics*; D005260:Female; D005102:Health Expenditures; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D009784:Occupational Diseases / Q000139:chemically induced; D012907:Smoking / Q000150:complications; D014481:United States