Which acid gas is indicated by the yellow label on a respirator?

The yellow label on a respirator signifies the presence of chlorine or other disinfectants, which are classified as acid gases. Chlorine is a highly reactive gas with significant respiratory hazards, and it requires specific types of respiratory protection to ensure the safety of individuals working in environments where such gases are present.

Respirators are labeled using a color-coding system to quickly convey information about the type of hazards they protect against. The yellow label specifically alerts users to the need for protection against chemicals like chlorine, which can be harmful if inhaled.

In contrast, other options such as ammonia and sulfuric acid have different labeling for respirators, indicating the presence of different hazards. Ammonia, for example, is a strong irritant with a different type of respiratory protective requirement, while sulfuric acid is a strong acid that presents a different type of risk, also warranting distinct protective measures.