# The Smoke Control Areas (Authorised Fuels)(Wales) Regulations 2001, Paragraph 17


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/2001/3762/schedule/1/paragraph/17 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuelswales-regulations-2001/schedule-1/paragraph-17
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.