Air purifiers are used to remove these pollutants from the air inside the house. Different types of air purifiers use filters, electrical attractions or ozone to purify the air. Filters have fine sieves which filter the impurities and other particles in the air. The finer the sieve, the more dust particles it can trap. The size of the dust particles is measured in microns. The naked eye can see only particles which have a size of 10 microns or more. So we are unable to see most of the allergens that are present in our house. The standard for air purification filters is called HEPA or High Efficiency Particulate Air. HEPA filters are guaranteed to trap 99.97% of airborne particles which are larger than 0.3 microns. HEFA specification filters can remove many types of allergens like dust, smoke, chemicals, pollen, asbestos and also pet dander. Each time the air passes through the filters, it becomes cleaner. The air purifiers have to be chosen depending on the room capacity and pollution level. Some brands have a ultra-violet light system in addition to filters to kill various bacteria, virus and fungi when they enter the air purifier. This is an additional safety measure for the filter and prevents the filter from getting contaminated by these organisms.
Electrical attraction technology is another technology used by air purifiers. These purifiers use fans and electrical wires. The fans draw in the dust particles and these particles are charged using the high voltage wires. These are attracted by the plates present in them which carry the opposite electrical charge. Electronic air purifiers do not require frequent replacement of the filters, but they emit ozone which again harms the environment. Ozone when inhaled directly, damages the lungs.