# The Control of Major Accident Hazards Regulations 1999, Paragraph 3: Polychlorodibenzofurans and polychlorodibenzodioxins


The quantities of polychlorodibenzofurans and polychlorodibenzodioxins are calculated using the following factors:
International Toxic Equivalent Factors (ITEF) for the congeners of concern (NATO/CCMS)
2, 3, 7, 8-TCDD
1
1, 2, 3, 7, 8-PeDD
0.5
1,2,3,4,7,8-HxCDD
1,2,3,6,7,8-HxCDD
1,2,3,7,8,9-HxCDD
0.1
1, 2, 3, 4, 6, 7, 8-HpCDD
0.01
OCDD
0.001
2, 3, 7, 8-TCDF
0.1
2, 3, 4, 7, 8-PeCDF
0.5
1, 2, 3, 7, 8-PeCDF
0.05
1, 2, 3, 4, 7, 8-HxCDF
1, 2, 3, 7, 8, 9-HxCDF
1, 2, 3, 6, 7, 8-HxCDF
2, 3, 4, 6, 7, 8-HxCDF
0.1
1, 2, 3, 4, 6, 7, 8-HpCDF
1, 2, 3, 4, 7, 8, 9-HpCDF
0.01
OCDF
0.001
(T=tetra, Pe=penta, Hx=hexa, Hp=hepta, O=octa)

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Source: https://www.legislation.gov.uk/uksi/1999/743/schedule/1/part/3n1/paragraph/3 (the official version)
Page: https://openlegislation.uk/control-of-major-accident-hazards-regulations-1999/schedule-1/part-3n1/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.