Abstract
Characteristics of particulate matter in rural Alberta locations were examined and compared with those in cities. Mean PM 2.5 and PM 10 concentrations at remote rural Alberta locations are 3.2 and 8.8 μg m −3, respectively. However, PM 2.5 and PM 10 concentrations at rural locations within 100 km of regional industrial and urban sources are 7.9 and 16.8 μg m −3, respectively. The mean PM 2.5 to PM 10 ratio in remote rural Alberta is about 0.4, similar to that observed in the cities. However, the ratio is about 0.5 in the rural locations influenced by regional sources. The PM 2.5 values at remote rural locations are about one-third of those observed in urban centres in Alberta. PM 2.5 concentrations in remote rural areas seem to constitute a “regional background” for Alberta. Sulphate content in PM 2.5 at remote rural locations varies from 0.3 to 1.4 μg m −3. A mean PM 2.5 sulphate content of 22% in rural Alberta is in the same range as that observed at nonurban sites in the northwestern United States.
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