Notices concerning emissions from chimneys and other outlets
3. A notice may relate to the emission of pollutants and other substances from any chimney, flue or other outlet used for the discharge, from any premises to the atmosphere, of any emission of any of the following kinds:—
(a)sulphur dioxide or particulate matter derived from any combustion process where the material being heated does not contribute to the emission;
(b)any gas or particulate matter derived from any combustion process where the material being heated contributes to the emission;
(c)any gas or particulate matter derived from any non-combustion process or other similar industrial activity.