Wastewater New York State Practice Exam

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What is the safe oxygen level for entering a confined space?

18 to 20 ppm
20 to 22 ppm
22 to 24 ppm
15 to 18 ppm

The correct answer is: 20 to 22 ppm

The safe oxygen level for entering a confined space typically falls within the range of 19.5% to 23.5% by volume in the atmosphere, which translates to a safe oxygen level that can effectively support normal bodily functions without risk of asphyxiation or other oxygen deficiency symptoms. The correct answer reflects a range that is considered safe for human safety within a confined space. Selecting the option that lists 20 to 22 ppm accurately reflects the acceptable levels of oxygen necessary for safe entry, as areas outside this range, particularly below 19.5%, can pose serious health risks. It's critical to ensure that oxygen levels are monitored and maintained within these parameters to prevent accidents or hazardous conditions when working in confined spaces. Maintaining oxygen levels within this safe range is essential not only for immediate safety but also to comply with occupational health and safety regulations, which are designed to protect workers in confined spaces.