maximum admissible concentration The maximum exposure to a physical or chemical agent allowed in an 8-hour work day to prevent disease or injury(8小时工作日中为避免致病或伤害而允许的最大可接触的物理或化学药剂量。)
maximum immission concentration The maximum concentration of air polluting substances in the free environment whose impact when of specified duration and frequency is not objectionable to man, fauna and flora(特定时段里自由环境中空气污染物的影响不至于引起人类和动植物发生不良反应的最大浓度。)
