So what can we do to protect ourselves against HCN poisoning? The answer may be simple. Wear your SCBA all the time, including during overhaul. Be aware of what's burning around you. Know the signs and symptoms of HCN poisoning. Finally, consider monitoring for HCN at fires. The Greensboro, NC, Fire Department is considering this possibly. The results of which will be included in a future article here at Firehouse.com.