# The Planning (Hazardous Substances) Regulations 2015, Paragraph 19


Potassium nitrate (1,250/5,000)
This applies to those composite potassium-nitrate based fertilisers (in crystalline form) which have the same hazardous properties as pure potassium nitrate.

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Source: https://www.legislation.gov.uk/uksi/2015/627/schedule/1/part/4/paragraph/19 (the official version)
Page: https://openlegislation.uk/planning-hazardous-substances-regulations-2015/schedule-1/part-4/paragraph-19
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.