# The Smoke Control Areas (Authorised Fuels) (Wales) Regulations 2008, Paragraph 24


Island Lump and Island Nuts, manufactured by Unocal Refinery, California, the United States of America, which—
(a) comprise petroleum coke;
(b) were manufactured from the petroleum coke by a process involving heat treatment and steam injection;
(c) are unmarked random shapes and have an average weight of 80 grammes (Island Lump) or 30 grammes (Island Nuts); and
(d) have a sulphur content not exceeding 2 per cent of the total weight.

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Source: https://www.legislation.gov.uk/wsi/2008/3100/schedule/paragraph/24 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-wales-regulations-2008/schedule/paragraph-24
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.