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Anti-pollution Totobobo 96% Filters (10 pairs) Top protection! High efficient, low resistance filter with sub-micron filtration performance. Extra high level of protection while being easier to breathe than typical N95 filter. Contains electro-static charges and is highly effective to trap fine dust and particles even below 0.3 micron. The filtration efficiency is at least 96%, suitable for blocking airborne pathogens such as viruses and bacteria. The effective usage time of the filter depends on a number of factors: - Concentration of contamination - Breathing rate - Heat - Humidity - Hygiene factors, and your environment. As a role of thumb, you should change the filters when the white filter turns 50% grey as printed on the filter packaging. On the other hand, it is recommended the filter should not be used longer than 2 weeks; even there is no signs of color change.