An increase in breathing resistance when using a respirator indicates what?

An increase in breathing resistance when using a respirator is primarily a signal that the respirator cartridge should be replaced. This increase often occurs when the filter media in the cartridge has become saturated or clogged with particulates, or its capacity to adsorb gases and vapors has been surpassed. When this happens, the user will experience greater difficulty in inhaling, indicating that the respirator is no longer providing the adequate protection it was designed for.

Recognizing this need for timely maintenance and replacement of cartridges is crucial for ensuring safety while working in environments with hazardous airborne contaminants. Proper monitoring of breathing resistance can therefore serve as a practical means of assessing the functionality of respiratory protection. Other options may relate to respirator fit or system integrity but do not explain the immediate issue of increased resistance as effectively as the need for cartridge replacement.