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(1)The Secretary of State may by regulations—
(a)apply all or any of the provisions of sections 5, 6, 7, 42(4) 43(5), 44(6) and 46(1) to fumes or prescribed gases or both as they apply to grit and dust;
(b)apply all or any of the provisions of section 4 to fumes or prescribed gases or both as they apply to smoke; and
(c)apply all or any of the provisions of section 11 to prescribed gases as they apply to grit and dust,
subject, in each case, to such exceptions and modifications as he thinks expedient.
(2)No regulations shall be made under this section unless a draft of the regulations has been laid before and approved by each House of Parliament.
(3)In the application of any provision of this Act to prescribed gases by virtue of regulations under this section, any reference to the rate of emission of any substance shall be construed as a reference to the percentage by volume or by mass of the gas which may be emitted during a period specified in the regulations.
(4)In this section—
“gas” includes vapour and moisture precipitated from vapour; and
“prescribed” means prescribed in regulations under this section.
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