[Changes in the incidence of respiratory symptoms in children during 3 years' observation].
D000293:Adolescent; D000393:Air Pollutants / Q000009:adverse effects; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D011044:Poland; D012120:Respiration Disorders / Q000139:chemically induced / Q000453:epidemiology*; D012424:Rural Population; D013458:Sulfur Dioxide / Q000009:adverse effects; D014505:Urban Population
D000393:Air Pollutants; D013458:Sulfur Dioxide
Zmiany czestości wystepowania objawów ze strony układu oddechowego u dzieci w okresie 3-letniej obserwacji.