It is variable, but on the machine I am tested on acceptable levels of DLCO range from 31.7 - 48.1. There are a number of other factors you need to pay attention to besides just this value. Talk with your doctor about these.
The "acceptable noise level" will depend on your specific needs! What is "acceptable" in one situation, may be utterly unacceptable in another.
A decision based on what constitutes an acceptable level of risk
It depends to the acceptable risk level in your company. Usually AFR=10 is acceptable in most companies.
Couple percents.
AQL - acceptable quality level
40-45db
It tries to attain an acceptable level of veracity.
The acceptable decibel level for a noise complaint to be filed typically ranges from 50 to 55 decibels during the day and 45 to 50 decibels at night.
The answer is a Threshold Value
acceptable error level
one percent
5 mg/L