asphalt impregnated felt underlayment for under wood floor

off-gassing of asphalt impregnated felt underlayment for under wood floor. Does anyone have any documented info indicating problems with off-gassing of asphalt impregnated felt underlayment for under wood floor? I work for a GC that wants to go by the Specs as much as possible however I'm concerned with off-gassing for many reasons - one being that we'll have IAQ testing done & need good results from the 1st test. I also know how strong asphalt smells and concerned it'll affect the IAQ test. Anyone have info I can cite confirming my concerns and the need to provide a substitute? Project is part historic renovation and part new construction. Wood floors will be installed in both. Thanks, Debra