Nadaafadda hawadu waa nooc ka mid ah heerarka kala soocidda caalamiga ah ee lagu isticmaalo qolka nadiifka ah.Caadiyan samee tijaabinta qolka nadiifka ah iyo aqbalida ku salaysan xaalad madhan, taagan iyo firfircoon.Xasiloonida joogtada ah ee nadaafadda hawada iyo xakamaynta polution waa halbeegga ugu muhiimsan ee tayada qolka nadiifka ah.Heerka kala-soocidda waxaa loo qaybin karaa ISO 5 (Class A/Class 100), ISO 6 (Class B/Class 1000), ISO 7 (Class C/Class 10000) iyo ISO 8 (Class D/Class 100000).
