Question

under which circumstances may it become necessary to shelter in place?

• chemical, biological, or radiological contaminants are released near the workplace
• large amounts of debris are present in the air
• local authorities say the air is badly contaminated and issue a shelter - in - place order
• all of the above

Explanation:

Chemical, biological or radiological contaminants near the workplace can pose risks, large - amounts of debris in the air are dangerous, and if local authorities issue a shelter - in - place order due to air contamination, it is necessary to follow. So all these situations call for sheltering in place.

Answer:

D. All of the above