Personal exposures of children to nitrogen dioxide relative to concentrations in outdoor air
Personal exposures of children to nitrogen dioxide relative to concentrations in outdoor air
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DOI：
10.1136/oem.57.7.472
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发表时间：
2000-07-01
影响因子：
4.9
通讯作者：
Coggon, D
中科院分区：
文献类型：
--
作者：
Linaker, CH;Chauhan, AJ;Coggon, D
Objectives-To investigate the relationship between the fluctuations in personal exposure to nitric dioxide（NO2）in school children and changes in outdoor NO2 concentrations.Methods-114 Asthmatic school children aged 7-12 years were recruited from the南安普顿area.每周平均个人暴露于NO2的被动扩散管测量超过13个月的时间。与此同时，在南安普顿中心的一个固定地点监测了室外NO2浓度。结果-平均随访时间为32周，每周平均个人NO2暴露量的测量值一般为0.7 - 496 μ g/m3，几何平均值为17 μ g/m3。儿童之间，特别是儿童个体之间，个人暴露量存在很大差异。NO2的日室外浓度范围为4.3至29.8 μ g/m3，几何平均值为12.3 μ g/m3。没有证据表明室外浓度存在季节性变化。没有显着的相关性，发现每个孩子的每周平均个人暴露于NO2和平均室外浓度为相应的periods. Conclusion，在低室外NO2浓度，在室外空气中NO2的波动，在中央监测站测量不重要的个人暴露的变化时，平均超过一周。
Objectives-To investigate the relation between fluctuations in personal exposure to nitrogen dioxide (NO2) in school children and changes in outdoor NO2 concentrations.Methods-114 Asthmatic school children aged 7-12 years were recruited from the Southampton area. Weekly average personal exposures to NO2 were measured over a 13 month period with passive diffusion tubes. At the same time, outdoor NO2 concentrations were monitored at a fixed site in the centre of Southampton. Correlations between weekly personal exposures and mean outdoor concentrations during the same periods were examined.Results-Mean duration of follow up was 32 weeks, Measurements of weekly mean personal NO2 exposures were generally law and ranged from 0.7 to 496 mu g/m(3) with a geometric mean of 17 mu g/m(3). Substantial variation in personal exposures occurred between children and more especially within individual children from week to week. Daily outdoor concentrations of NO2 ranged from 4.3 to 29.8 mu g/m(3), with a geometric mean of 12.3 mu g/m(3). There was no evidence of seasonal variation in outdoor concentrations. No significant correlation was found between each child's weekly mean personal exposures to NO2 and mean outdoor concentrations for the corresponding periods.Conclusion-At low outdoor NO2 concentrations, fluctuations in NO2 in outdoor air as measured at a central monitoring station do not contribute importantly to variations in personal exposure when averaged over a week.