2. In these Regulations—
“the Act” means the Environmental Protection Act 1990;
“background concentration” has the meaning given to that term in regulation 4(7);
“Part A process” means a process falling within a description set out in Schedule 1 hereto under the heading ‘Part A’ and “Part B process” means a process falling within a description so set out under the heading ‘Part B’; and
“particular matter” means grit, dust or fumes.