There is strong evidence for causality between short-term SO2 exposures and respiratory morbidity, based on controlled human exposure studies looked at by Health Canada.
Sulphur Dioxide and Health
Summary of recent findings from Health Canada

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Leading the transition to clean energy requires advancing solutions to today’s energy challenges from various angles.
The Pembina Institute has spent four decades working to reduce the environmental impacts of Canada’s energy production and to provide actionable ideas on how to implement clean energy.