Atmospheric emissions from oil sands plants are regulated by government. Both Syncrude Canada Ltd. and Suncor Inc. independently operate emission and air quality monitoring and reporting systems. The systems include air quality monitoring trailers and sulphation cylinder stations. In addition to the required monitoring, both Syncrude and Suncor conduct a number of voluntary monitoring research projects to enhance the understanding of regional atmospheric conditions, and the cumulative ecological effects of emissions from oil sands plants in the area. This report presents a consolidation of the findings of four individual projects sponsored by Syncrude. The study area for this report was centred over the emission sources, and extended approximately 50 km around the plants. The additional monitoring projects included stack gas sampling, elemental analysis, and dispersion modelling. Two biological monitoring programs have also been conducted to measure vegetation stress and bioaccumulation of elements in lichens and mosses. The biological monitoring studies were initiated prior to the start-up of the Syncrude plant, and continued with repeat sampling in 1983 and 1984.