Article Text
Correspondence
Personal exposure of children to nitrogen dioxide
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We read with interest a recently published study on personal exposure of asthmatic children to nitrogen dioxide (NO2), relative to concentrations in outdoor air.1 In their results, the authors did not find:
“ . . .significant correlation . . . between each child's weekly mean personal exposures and mean outdoor concentrations for the corresponding periods”;
“ . . .marked evidence of seasonality” on personal exposure .
They concluded: “ . . .at low concentrations, changes in NO2 in outdoor air . . .contribute little to variations …