Survival Preparedness Guide – Air:
If the air is contaminated with organic dust you will need NIOSH-Approved N95 disposable respirator masks, which are designed to filter at least 95% of airborne particles.
These masks are available at hardware stores, mass merchandise warehouses or online, for pennies per unit. They come with or without an exhale valve although the extra cost for the valve is well worth it.
They will fit all adults and all but the smallest children, who will require a bandana tied over the mask to prevent unfiltered air from being inhaled.
There is no way of knowing how many of these you will need per person but as with all survival preparedness, more is always better than less.
If the air is contaminated with noxious odors, vapors, solvents or other gasses, you will need an industrial type half-face or full-face respirator with NIOSH- Approved replaceable filer elements for organic vapors, acid gases, ammonia, methylamine or formaldehyde.
These respirators are available in small, medium and large sizes. The filter elements are interchangeable, long lasting and inexpensive for the benefits gained. The full-face type is recommended because of the eye and face protection offered.
This is not a wise place to economize. Buy as many of the disposable masks as your budget allows. Also purchase a replaceable element respirator and several replacement elements per respirator, for each member of your family.