Using a mask rated for 95% filtration efficiency, such as an N95 respirator, can provide effective protection against silica dust, which is a known respiratory hazard. N95 masks can filter out at least 95% of airborne particles, including fine dust like silica, when properly fitted and used.
However, it is important to ensure that the mask fits properly to achieve the intended level of protection. A good seal around the face is necessary to prevent unfiltered air from being inhaled. Additionally, for tasks involving high levels of silica dust, you may want to consider other types of respirators or additional protective measures, especially in occupational settings.
Always consult safety guidelines and regulations relevant to your specific situation, as well as seek advice from occupational health professionals if needed.