New legislation for companies that use hazardous substances entered into force on 8 July 2015. The aim of the new Risks of Major Accidents Decree (Brzo 2015) is to prevent major accidents. The new rules implement the Seveso III Directive and replace the Brzo 1999 rules. The most significant changes are the new classification and threshold values in hazardous substances. This can lead to a situation where a company has to comply with the Brzo 2015 as of 8 July 2015, even though it did not have any obligations under the previous Brzo 1999 regime, or where the company becomes subject to a stricter regime than before.