As buildings are tightened for energy conservation purposes, the concentration of indoor-generated air pollutants can increase. Federal agencies, state agencies, utilities, and public health organizations have an interest in indoor air-pollution levels and the impact various policy decisions will have on them. This paper identifies key parameters that affect indoor air pollutant levels from combustion related sources and suggests protocols for measuring each parameter. Indoor air quality field studies should measure the indoor pollutant levels themselves and the key parameters that affect such levels. Key parameters such as appliance usage patterns, indoor pollutant reactivity rates, local ventilation effects, air exchange rates, and source usage driving forces are addressed. In addition, state-of-the-art measurement techniques, time sampling periods, and overall sample sizes needed are briefly discussed.