Patent ID: 8038778

Claim:
An apparatus for purifying polluted air consisting of particle phase pollutants and gaseous phase pollutants, the apparatus comprising: a dust level sensor to measure the amount of particle phase pollutants in the polluted air; a dust removal component to remove the particle phase pollutants from the polluted air; a catalyst filtering core to decompose the gaseous phase pollutants by chemical reaction; a valve for selectively controlling a path of air flow within the apparatus and is movable between an open position and closed position, the valve being positioned downstream from the dust removal component; wherein if the amount of particle phase pollutants measured by the dust level sensor is above a predetermined value, the valve is moved to the open position to enable the air to bypass the catalyst filtering core; and if the amount of particle phase pollutants measured by the dust level sensor is less than a predetermined value, the valve is moved to the closed position to force the air to pass through the catalyst filtering core.