Indoor Air sciences CSMI Practice Exam

According to OSHA, what is the threshold for an oxygen deficient environment?

1. 20.5%

2. 19.5%

3. 21.5%

4. 18.5%

The correct answer is: 19.5%

The threshold for an oxygen-deficient environment is established by OSHA at 19.5%. This standard is crucial for ensuring the safety of workers in environments where oxygen levels can drop due to various factors, such as confined spaces or the presence of certain chemicals. In a typical atmosphere, oxygen makes up about 21% of the air. When the oxygen concentration falls below 19.5%, it can create a hazardous situation that significantly increases the risk of asphyxiation and other oxygen-related health issues. Understanding this threshold is vital for workplace safety because it informs safety protocols and emergency response plans. Areas where the oxygen level is measured to be below this threshold require appropriate precautions, such as ventilation or the use of breathing apparatus, to protect workers from the potential dangers associated with low oxygen levels.