Health measures that work for some people might not necessarily work for others. Different people have different levels of sensitivity, and as such might require different levels of protection and different types of masks to protect against the same type and concentration of substance. Also, the wrong mask at the wrong time, or a mask improperly used might do little to protect you from what you’re trying to avoid, and in some cases may even make your exposure worse. Furthermore, no mask is capable of protecting against an offending substance 100% and is no substitute for complete avoidance of the substance.
Please consult your doctor when deciding whether and how to incorporate a mask into your health routine. When using a mask, make sure you carefully read instructions on the mask package as to the proper wearing and use of the mask, including cleaning instructions, when to stop wearing it or when the filter needs changing.