In a well-known Sherlock Holmes story, Holmes solved a murder mystery by pointing to the “curious incident of the dog in the night-time”. “The dog did nothing in the night-time”, countered the Scotland Yard detective on the case. “That was the curious incident” replied Holmes. Health Canada estimates that air pollution accounts for 15,300 premature deaths annually in Canada. All the key air pollutants are found on Canada’s list of toxic substances, giving Environment and Climate Change Canada (ECCC) full authority to regulate emissions. And yet there are only a handful of federal regulations addressing air pollution from industrial/stationary sources. This case study addresses the question – why doesn’t the dog bark?