There is a tiered approach to the level of controls: the larger the quantities of dangerous substances present within an establishment, the stricter the rules (upper-tier establishments have bigger quantities than lower-tier establishments and are therefore subject to tighter control).
Kontrollimeetmete süsteem on astmeline: mida suuremad on ohtlike ainete kogused ettevõttes, seda karmimad on eeskirjad (kõrgema astme ettevõtetes on kogused suuremad ja selliseid ettevõtteid ka kontrollitakse kõvemini).