SASKATOON -- Mayor Charlie Clark says the City of Saskatoon must look at ways to keep people safe from carbon monoxide (CO) poisoning. It comes after nearly 50 residents, including several children, at an apartment building in the Greystone Heights Neighbourhood received medical attention after dangerously high levels of CO were detected in the building. “It’s raising a lot of questions about, is there a risk that this could happen again and how do we prevent what could have been a tragedy in this case from potentially happening in the future and save lives,” Clark told CTV News. The apartment complex at 12 Bateman Crescent did not have CO alarms installed at the time of the leak – and was not required to under the National Building Code, which only mandates the detectors for buildings constructed after 2009.