One of these harmful byproducts is the ash released from incinerators, not only through smoke stacks but also through bottom ash. According to alternative-energy-news.info, furnace bottom ash is mixed with slag that accounts for 10% by volume and accounts for approximately 20-35% by weight of the incoming solid waste (Zafar, 2008). Ash released into the air contains much lower amounts of pollution than bottom ash. Most pollutants come from plastic burned in incinerators. Some of this fly ash can be captured through very expensive filters inside smokestacks, but even then not all pollutants will be captured. Furthermore, the filters inside these smokestacks will have to be disposed of in a specialized center