Activated carbon is manufactured from charcoal in a process called activation. This process opens up the pores inside and makes the charcoal extremely porous. Just 50 grams of activated carbon have an internal surface equivalent to a surface of 10 football fields and there is 1500g of activated carbon in 420 Purifier smoke purifier. The porous structure behaves like a sponge absorbing molecules from the air. Activated carbon is able to purify smoke of many toxic substances such as ammonia, benzene, formaldehyde, nitric oxides and VOC’s (Volatile Organic Compounds) which represent a vast majority of molecules that we perceive as smell.