I wouldn't worry about storing a bike in a room such as you describe. Carbon monoxide will not attack your tires; besides, the equipment is malfunctioning if significant CO is present. As the previous poster pointed out, ozone attacks rubber. This is generated to a small extent by electric motors (sparking), but is present in polluted cities, mainly from the photochemical action of sunlight on unburnt hydrocarbons (fuel vapors, etc.).