# The Dangerous Substances (Notification and Marking of Sites) Regulations 1990, Paragraph 2


The reduction of the total quantity of dangerous substances present at the site to below 25 tonnes at the site other than a temporary reduction.

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Source: https://www.legislation.gov.uk/uksi/1990/304/schedule/2/part/II/paragraph/2 (the official version)
Page: https://openlegislation.uk/dangerous-substances-notification-and-marking-of-sites-regulations-1990/schedule-2/part-II/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.