Statistics Canada plays a very important role in the development and maintenance of the database on greenhouse gas emissions. Statistics Canada plays a less central role in the collection of information about air pollutants. I think that's primarily because the provincial governments and the federal government have been collecting that information for quite a long time, and therefore were working with some relatively old systems. The national system for greenhouse gas inventory was developed in close collaboration with Statistics Canada.
On February 5th, 2007. See this statement in context.