There's no shortage of choices when choosing that all-important respirator. To help you out with your selection process, 3M gave our sister publication Remodeling advice on what to consider when looking.
Remember to consider hazard, comfort, fit, and compatibility with other equipment when choosing. Also, keep in mind that a disposable respirator helps protect a worker from solid and liquid particulates (dusts and mists) in the air while a reusable respirator can help protect a worker from gases and/or vapors.
On the other hand, a half-facepiece reusable respirator with appropriate chemical cartridges is best for painting applications or renovation projects where you may be using chemicals or sprays that release gases or vapors:
Regardless of whether you are using a disposable or reusable respirator, remember that a proper fit and seal to the face is the most important factor for respirator effectiveness. A proper fit will help prevent contaminants from entering the respirator through gaps in the seal. That’s why it’s important for workers to be clean-shaven when using tight-fitting respirators.