# The Planning (Hazardous Substances) Regulations 2015, Paragraph 15


Ammonium nitrate (1,250/5,000): fertiliser grade
This applies to straight ammonium nitrate-based fertilisers and to ammonium nitrate-based compound/composite fertilisers which fulfil the requirements of Annex III-2 to Regulation (EC) No 2003/2003 and in which the nitrogen content as a result of ammonium nitrate is—
(a) more than 24.5% by weight, except for mixtures of straight ammonium nitrate based fertilisers with dolomite, limestone and/or calcium carbonate with a purity of at least 90%;
(b) more than 15.75% by weight for mixtures of ammonium nitrate and ammonium sulphate;
(c) more than 28% by weight for mixtures of straight ammonium nitrate-based fertilisers with dolomite, limestone and/or calcium carbonate with a purity of at least 90%.

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Source: https://www.legislation.gov.uk/uksi/2015/627/schedule/1/part/4/paragraph/15 (the official version)
Page: https://openlegislation.uk/planning-hazardous-substances-regulations-2015/schedule-1/part-4/paragraph-15
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.