Abstract
Objectives To investigate the progress and effects of control measures and dynamic prevalence of coal-burning endemic fluorosis in order to provide basis and technique support for endemic fluorosis control in China. Methods The survey was carried out according to the national survey .scheme of endemic fuorosis. Fifteen villages of 9 counties in 8 provinces in coal-burning fluorosis area were selected as survey spots. The fulfillment and quality of improving stove in survey counties was surveyed. Samples of indoor air, corn, chili and children urine in survey spots were collected, and the fluoride content was detected by ion selected method. Dental fluorosis and defective dental fluorosis in children of 8-12 years old were diagnosed by Dean method. In 8 newly added spots, adult skeletal fluorosis was diagnosed by national criteria (Diagnosis of Clinical Classification for Endemic Skeletal of 430 409, and the rate of improved stoves increased by 9.86 percent, coming to 42.74% (430 409/1 007 058). surveyed, and the averaged daily level of 5 villages exceeded the standard(0.007 mg/m3), ranging from 0.0172-standard(1.5 mg/kg for corn, 1.0 mg/kg for chili.), especially in provinces of Yunnan, Guizhou and Sichuan(12.68-children dental fluorosis of 1 spots was 60%-80%, and 7 sports>80%. The detectable rate of defective dental fluorosis of 10 survey spots was 40%. Among 14 survey spots where urine sample were detected, geometric mean of urine fluoride content in 8 new spots were among 4.86%-60.03%, and that for Ⅲ degree skeletal fluorosis was among 0-4.86%. Conclusions The rate of improved stoves in surveyed counties increased by about 10% in 2006, and the improved stoves worked well. Indoor air, corn and chili were still contaminated by fluoride. The prevalence of fluorosis in old survey spots has been controlled or alleviated, and most of the new survey spots are of moderate epidemic area. Key words: Coal; Air pollution, indoor; Fluorosis; Surveillance
Published Version
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