Standards of Permissible Exposure Limits at Job Site Article 5
As used herein, “ppm” (parts per million) refers to one cubic centimeter of a gaseous hazardous substance per cubic meter of air, measured at 25oC and 760 torr.
中文原文 勞工作業場所容許暴露標準第5條
本標準所稱ppm為百萬分之一單位，指溫度在攝氏二十五度、一大氣壓條件下，每立方公尺空氣中氣狀有害物之立方公分數。