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Additional info for Air Quality Management: Canadian Perspectives on a Global Issue
There are indications that some particles are much more “active” in causing health responses than others. Currently there are no measurements of ambient constituents of particulate matter being carried out nationally according to agreed protocols. Thus it will be some time (decades at least) before we see a fully evidence-based approach to management of particulates. While the health science is moving towards certainty about health impacts of particulate matter, the physical science side is still not in a good position to respond to the health driver with crisp approaches to management of the issue.
Harvey et al. 1981; US/Canada Work Groups 3A 1981, 2 and 3B 1982, 1 1983; Schindler 1988; Atmospheric Environment Service 1998). This work proceeded in the midst of complaints that the costs of dealing with acid rain would lead to uncompetitive industry and huge overhead costs. Nonetheless, in the 1970s and 1980s the emerging consensus on aquatic effects justified action on sulphur dioxide and nitrogen oxides emission controls. In 1985, a domestic “Acid Rain Control Program” was established. In the seven eastern provinces, a 40 % sulphur dioxide emission reduction from 1980 levels by 1994 was required.
5. 5 to acid rain and ozone and supported the concept of “one atmosphere”. Air Quality Managers could no longer address each pollutant separately and atmospheric models that were used in assessing air quality control strategies embraced this concept. The emissions of particulates are also complex with both primary and secondary routes being important. g. road dust, airborne soil, pollen, plant and animal fragments). Both primary (directly emitted) and secondary (formed in the atmosphere) fine particulate come from combustion processes such as transportation and power generation and can include a wide array of constituents from heavy metals to elemental and organic carbon as well as sulfates and nitrates.