In today’s period, the major threat to the whole world is the degradation of the environment. It is all due to the carelessness shown by man towards Mother Nature. The result of such negligence can cause huge hazards on this earth. People have recognized the danger and are taking various steps so as to protect the Mother Nature. The chief danger for mankind is the contamination of the air with various harmful pollutants. These pollutants can cause serious health problems to people. Scientist has invented various types of air cleaning equipments that act as a good measure for freeing the air from harmful contaminated pollutants.Air cleaning equipments can be described as various types of systems that are set in ventilation, heating, air conditioning systems or are even used individually for reducing the pollutants present in the air. These pollutants may comprise of dust, dust mites, pollen, mold spores, harmful gases etc.