To investigate the differences between measurements of personal exposure to particulate air pollution and static area measurements in a group of people working close to traffic and to determine whether such differences might obscure any threshold for health effects in epidemiological studies.
Methods-Personal air sampling was carried out on two groups of eight traffic wardens for four days on two consecutive weeks in November 1994.
These measurements were compared with standard environmental static sampling data that were obtained for the same period.
A simulation with log normal distributions of personal exposures was produced, and an arbitrary risk calculated for each exposure, assuming a threshold of 50 mug/m3, and an exposure-response curve was calculated.
The median concentration for personal samplers in week 1 was 123 mug/m3 and 41 mug/m3 in week 2. Corresponding area concentrations were 10 mug/m3 and 7.5 mug/m3.
The simulation showed that the variation in individual exposures around an area sampler obscured the threshold.
Conclusions-Area sampling data may be of limited value in the investigation of the biological effects of exposure to pollution and their use may result in real thresholds being obscured.
Personal exposure assessment may be crucial in determination of the health effects attributable to different concentrations of air pollutants.
Mots-clés Pascal : Pollution air, Gaz échappement, Trafic routier, Milieu urbain, Homme, Exposition professionnelle, Teneur air ambiant, Analyse quantitative, Contrôle, Appareil portatif, Concentration maximale admissible, Médecine travail, Contractuel
Mots-clés Pascal anglais : Air pollution, Exhaust gas, Road traffic, Urban environment, Human, Occupational exposure, Ambient air concentration, Quantitative analysis, Check, Portable equipment, Maximum permissible concentration, Occupational medicine
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0051778
Code Inist : 001D16C03. Création : 199608.