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Description - Figure 4 - Final Human Health State of the Science Report on Lead

Figure 4 Average concentration of lead in ambient air in Canada
Bar chart showing average lead concentrations in ambient air from 1970 to 2008 measured in micrograms per cubic metre. Values between 1970 and 1983 were measured as total suspended particles while values from 1984 to 2008 included measurements on dichotomous filters.
1970 approximately 0.71; 1971 approximately 0.61; 1972 approximately 0.58; 1973 approximately 0.57; 1974 approximately 0.47; 1975 approximately 0.44; 1976 approximately 0.39; 1977 approximately 0.40; 1978 approximately 0.37; 1979 approximately 0.34; 1980 approximately 0.33; 1981 approximately 0.31; 1982 approximately 0.27; 1983 approximately 0.22; 1984 approximately (0.17 to 0.22); 1985 approximately (0.14 to 0.19); 1986 approximately (0.14 to 0.17); 1987 approximately (0.10 to 0.12); 1988 approximately (0.06 to 0.08); 1989 approximately (0.04 to 0.05); 1990 approximately 0.02; 1991 approximately 0.02; 1992 approximately 0.02; 1993 approximately 0.025; 1994 to 2008  less than 0.02.