Nadiifinta hawadu waa nooc ka mid ah heerarka kala soocida caalamiga ah ee lagu isticmaalo qolka nadiifka ah. Caadiyan samee tijaabada qolka nadiifka ah iyo aqbalida ku salaysan xaalad madhan, taagan iyo firfircoon. Xasiloonida joogtada ah ee nadaafadda hawada iyo xakamaynta wasakheynta ayaa ah heerka 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).
