Canadian classification according

Canadian Wheat Classification According to Properties and Gluten... 

Angina may be classified according to symptom severity, disability induced, or a specific activity scale (Tables 15-1 and 15-2). The specific activity scale developed by Goldman and coworkers may be preferable because it has been shown to be equal to or better than the New York Heart Association (NYHA) or Canadian Cardiovascular Society (CCS) functional classifications for reproducibility and provides better agreement with treadmill testing. 

The study area is situated near Rouyn-Noranda, about 600 km to the north-west of Montreal, Canada (48°14 N, 79°01 W). Three sites were sampled at a downwind distance of 0.5, 2 and 8 km from the Horne copper smelter. At each site, soil samples were collected under three trembling aspen Populus tremuloides Michx) of similar age (< 30 years old). The soils developed in postglacial lake sediments of silt texture to form Luvisols, according to the Canadian System of Soil Classification (Soil Classification Working Group, 1998). The extent of soil contamination received through the atmospheric deposition of metals represents the main difference between the three sites as other characteristics were kept constant (e.g. climate, parent material, slope, aspect, etc.). For a more detailed description of the sites, see Seguin et al. (2004). 

One other approach that was considered was ranking chemicals by groups according to their physical and chemical properties. A number of properties were selected, for example, LD50, bioaccumulation, and persistence as the main criteria for toxicity to the environment and humans. Substances were then classified according to the range they fell within (Ministers Advisory Panel, 1995). This approach was used for the Canadian Environmental Protection Act (CEPA) assessments. For example, polychlorinated dibenzodioxins, polycyclic aromatic hydrocarbons, inorganic cadmium compounds, benzidine, trichloroethylene, and a host of others were concluded to be toxic. Others, such as chlorobenzene, toluenes, xylenes, and dibutyl pthalate, were concluded to be nontoxic. Others, such as aniline, styrene, crankcase oils, and pentachlorobenzene, do not have sufficient information for classification. 

P-20 Standard for the Classification of Toxic Gas Mixtures. While pure gas toxic designations are well known, this standard is the first to establish a means of classifying the toxicity of gas mixtures in accordance with the definitions of toxic or poison as contained in DOT and Canadian Transportation of Dangerous Goods (TDG) regulations and to coincide with International Organization for Standardization (ISO) values (18 pages). 

---