maximum permissible level; tolerable limit; allowable dosage
Used in technical, medical, and regulatory contexts for the upper limit of a substance, radiation, or other factor that is considered safe or acceptable.
The maximum permissible levels of food additives are set by law.
You must not exceed the annual allowable dose of radiation.
限度 is a general limit or bound; 許容量 is a limit based on safety or tolerance standards.
Compound of 許容 (permission, tolerance) and 量 (amount, quantity).