How stable are chlorine-based refrigerants without hydrogen in the lower atmosphere?

Chlorine-based refrigerants that lack hydrogen are known for their significant stability in the lower atmosphere, primarily due to their molecular structure. These refrigerants can persist in the environment for an extended period, often remaining unchanged for many decades. Their stability is largely attributed to the absence of hydrogen, which typically facilitates degradation processes in the atmosphere, such as reaction with hydroxyl radicals.

In this case, the correct answer indicates that chlorine-based refrigerants can remain stable even after 100 years or more once released into the atmosphere. This extended longevity raises concerns about their environmental impact, particularly in relation to ozone depletion and global warming. Understanding this stability is critical for professionals in the field of fire alarm systems, as they need to be aware of all hazardous materials and their long-term impacts when dealing with fire safety equipment that may contain such refrigerants.