Populations at risk from air pollution--United States, 1991.
D000367:Age Factors; D000368:Aged; D000393:Air Pollutants / Q000009:adverse effects*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000150:complications; D011247:Pregnancy; D015995:Prevalence; D011336:Probability; D012140:Respiratory Tract Diseases / Q000150:complications; D012307:Risk Factors; D014481:United States
D000393:Air Pollutants