You will like this filter for face protection.

Looking for added protection for your face mask? Many of the face masks now have a slot or insert area for you to slip a filter into for extra protection against airborne contaminants.  This carbon filter will fit into most of our face masks.  You will receive 2 face mask filters in a plastic bag. 

• Five-layer Filtration: Multiple protection to isolate dust, multi-layer folding, good ventilation, double your protection with an additional filter.
• PM2.5 Activated Carbon Replaceable Anti Haze Filter. Filters size: 12x 8 cm/ 4.7 x 3.1 inches.
• Filtration technology: made of activated carbon and non-woven melt-blown filter cloth, 5-layer filter system effectively keep away from PM 2.5 and a range of airborne contaminants.
• Activated Carbon Filter anti airborne particles dust, smoke, pollution, ash, gardening pollen and so on, suitable for most occasions.
• 2 Pcs. per order.

Free shipping on all USA orders over $99.