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”](https://brieflywriting.com/2012/07/25/the-dog-that-didnt-bark-what-we-can-learn-from-sir-arthur-conan-doyle-about-using-the-absence-of-expected-facts/). “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](https://www.canada.ca/en/health-canada/services/publications/healthy-living/2021-health-effects-indoor-air-pollution.html) 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](https://www.canada.ca/en/environment-climate-change/services/canadian-environmental-protection-act-registry/substances-list/toxic.html), 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?