In the presence of fumes and gases, respiratory protection should be used as:

• A. The primary safeguard against fumes and gases.
• B. Only as a last resort
• C. No protection is necessary.
• D. It should be used even when ventilation is sufficient.

Answer: (B)

The main idea is that protecting workers from fumes and gases follows a hierarchy of controls, with PPE treated as the last line of defense. Engineering controls such as local exhaust ventilation, enclosure of the process, or changes to the welding method are preferred because they remove or reduce the hazard at the source and don’t depend on a worker’s actions to be effective. Respiratory protection is then used only when those controls can’t bring exposure to safe levels or for short, unplanned tasks where engineering controls aren’t feasible.

That’s why respiratory protection is described as a last resort. It relies on proper selection, fit, and a formal program (medical evaluation, fit testing, training, maintenance), and it may not fully eliminate risk due to issues like imperfect seal, cartridge selection, or changes in conditions. In welding, some fumes and gases require specific respirator types, and certain atmospheres (like oxygen-deficient or IDLH conditions) demand even more protective measures than a respirator alone.

If ventilation already keeps exposure within safe limits, respiratory protection isn’t required. So using respiratory protection only as a fallback when other controls don’t suffice best reflects safe practice in the presence of fumes and gases.