Within the multicentre VESTA case-control study on childhood asthma and traffic air pollution, the authors studied the association between the respiratory function and NO2 personal exposures or intensity of traffic close to homes and schools. The relative contribution of different indoor and outdoor emissions sources on personal NO2 exposures was also assessed. The respiratory function (forced expiratory volume in one second - FEV1 - and peak expiratory flow rate - PEFR) was measured with a One-Flow tester. NO2 personal exposure was measured using passive Ogawa samplers that were worn during 48 hours by study participants, aged 4 to 14 years old. Exposure to traffic exhausts was assessed through an index based on a time-weighted average of traffic density to road distance ratios. The most influential variables that predicted NO2 personal exposures were the traffic index, use of a gas cooker at home and background ambient air pollution, with variable associations across cities (model R2 rank from 0.33 to 0.67). No association was found between the respiratory function and the levels of NO2 personal exposure; FEV1 oder PEFR values, however, were associated with the traffic index, in two out of four cities. These results suggest that cumulative exposure to traffic exhausts may alter the respiratory function of children.
Road traffic, NO2 exposure and respiratory function among children (VESTA study)
VESTA Studie. Straßenverkehr, Stickstoffoxidkontakt und Atemfunktion bei Kindern
International Journal of Vehicle Design ; 27 , 1-4 ; 251-261
2001
11 Seiten, 3 Tabellen, 19 Quellen
Article (Journal)
English
Road traffic, N02 exposure and respiratory function among children (VESTA study)
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