Naturally it would be panic-mongering to suggest that all of these are dangerous to humans, because many of them have an insignificant impact on the human body. For some it is simply a matter of keeping the volume below a certain "permissible amount."
當「容許量」相加… … 當然，如果說這些物質都會危及人體未免危言聳聽，因為許多物質對人體的影響仍十分不明確，或者有的只要維持某一容量之內，即無傷大雅。