In this Part of this Act—
(a) in England and Wales, the council of a district or a London borough, the Common Council of the City of London, the Sub-Treasurer of the Inner Temple and the Under Treasurer of the Middle Temple, and
(b) in Scotland, an islands or district council;
"local authority" means—
"private dwelling" has the same meaning as in Part I of this Act; and
"a work subject to the Alkali Act" means a work registered under section 9 of the Alkali Act, excluding the whole or part of such a work while the work or part is the subject of an order made or treated as made under subsection (3) of section 11 of the Clean Air Act 1968 (under which certain enactments relating to clean air which apart from that subsection do not apply to works so registered may be applied to such works).
References in this Part of this Act to the emission of substances into the atmosphere shall be construed as applying to substances in a gaseous or liquid or solid state, or any combination of those states.
Any reference in this Part of this Act to measurement includes a reference to the taking of samples.