www.firesmoke.org is all I need to say on this topic. The most comprehensive information you will ever read on "smoke".
Wear your air.
My answers to your questions is YES to all three. Currently we monitor for CO and HCN with action levels of 35ppm and 5 ppm respectively. We do not at this time have a gas monitor for H2S. Yes we have an SOG that references the use of SCBA. SCBA is not required if the levels are below the above action levels. The department began because me being Safety Officer and being a proponent for the 16 life safety initiatives, warranted it. We recently had about a 50% turnover and we are making significant progress instilling it into the newer staff both from an officer side and also from the newbie side. Educate them on the effects of both CO and HCN and they will see the importance.
Jesse. Training Officer, St Clair Shores, MI.