Patent ID: 8685150

Claim:
A passive air pollution filtration system comprising: a passive air filter with a filter bag portion, amorphous silica, and a means of attachment or restraint; the filter bag portion having at least one layer of filtration material; the filter bag portion having a first filter bag with a layer of filtration material and having either an outer protective bag surrounding the first filter bag or a second filter bag wherein the second filter bag is identical to the first filter bag wherein the first bag is inserted top down into the second filter bag, the second filter bag closed by a means of restraint; an outer protective bag surrounding the second filter bag; the amorphous silica is non-carcinogenic, uncalcined natural diatomaceous earth, and is contained and restrained within the first bag; said filter bag has a transition temperature of about 26-27Â° C. when placed in an indoor air volume or volume of other gas, the transition temperature defined as the temperature above which amorphous silica ceases adsorbing and begins to desorb water molecules, other adsorbed gaseous molecules and small particulates due to increased Brownian Motion; said passive filters requiring no fan or other air moving means, pollutants being absorbed via osmosis in cool air below the transition temperature; the filter system can be regenerated by physical removal from the air volume or other gas volume after a period of use by heating the filter system in either sunlight or a heating chamber to a temperature above the transition temperature for a sufficient period of time such that the filter is regenerated and the filter system is returned to service in the air volume or other gas volume.