Estimating distributions of long-term particulate matter and manganese exposures for residents of Toronto, Canada.
Methylcyclopentadienyl manganese tricarbonyl (MMT), a manganese-based gasoline additive, has been used in Canadian gasoline for about 20 yr.
Because MMT potentially increases manganese levels in particulate matter resulting from automotive exhausts, a population-based study conducted in Toronto, Canada assessed the levels of personal manganese exposures.
Integrated 3-day particulate matter (PM2.5) exposure measurements, obtained for 922 participant periods over the course of a year (September 1995-August 1996), were analyzed for several constituent elements, including Mn.
The 922 measurements included 542 participants who provided a single 3-day observation plus 190 participants who provided two observations (in two different months).
In addition to characterizing the distributions of 3-day average exposures, which can be estimated directly from the data, including the second observation for some participants enabled to use a model-based approach to estimate the long-term (i.e. annual) exposure distributions for PM2.5 mass and Mn.
The model assumes that individuals'3-day average exposure measurements within a given month are lognormally distributed and that the correlation between 3-day log-scale measurements k months apart (after seasonal adjustment) depends only on the lag time, k, and not on the time of year. (...)
Mots-clés Pascal : Canada, Amérique du Nord, Amérique, Toronto, Trafic routier urbain, Véhicule à moteur, Essence sans plomb, Antidétonant, Manganèse Carbonyle Complexe, Manganèse Composé organique, Complexe hapto, Manganèse(êta5-méthylcyclopentadiényl) complexe, Zone urbaine, Pollution air, Qualité air, Homme, Exposition, Surveillance, Métal lourd, Manganèse, Particule en suspension, Aérosol, Teneur, Analyse donnée, Loi probabilité, Simulation
Mots-clés Pascal anglais : Canada, North America, America, Urban road traffic, Motor vehicle, Unleaded gasoline, Antiknock additive, Manganese Carbonyl Complexes, Manganese Organic compounds, Hapto complex, Urban area, Air pollution, Air quality, Human, Exposure, Surveillance, Heavy metal, Manganese, Suspended particle, Aerosols, Content, Data analysis, Probability distribution, Simulation
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0243563
Code Inist : 001D16C04C. Création : 16/11/1999.