(1) A works approval under section 19A(1) or (2) of the Act or a licence under section 20(1) of the Act is not required with respect to discharges or emissions to air from the following—
(a) a source, other than an incinerator or an afterburner, discharging or emitting less than—
(i) 100 kilograms per day Oxides of Nitrogen; and
(ii) 10 kilograms per day Oxides of Sulphur; and
(iii) 100 kilograms per day Carbon Monoxide; and
(iv) 5 kilograms per day volatile organic compounds of which none are odorous compounds (except those substances referred to in subparagraphs (vii) and (viii)); and
(v) in the case of—
(A) a source that discharges or emits at any time during the 12 months before 25 June 2017, 10 kilograms per day particles (except lead, respirable crystalline silica and asbestos); and
(B) any other source, 10 kilograms per day particles (except lead, respirable crystalline silica and asbestos), including no more than 4 kilograms per day Particles as PM 2·5 ; and
(vi) 0·1 gram per minute of lead; and
(vii) 0·1 gram per minute of any substance classified as a Class 2 indicator (except Particles as PM 2·5 ); and
(viii) 0·1 gram per minute of any substance classified as a Class 3 indicator;
(b) a standby engine;
(c) fire fighting training activities;
(d) a spray booth, extractor vent system or fume cupboard used in product development or in a laboratory;
(e) a safety relief valve or rupture disc;
(f) a vent on a wastewater treatment system except at a sewage treatment plant;
(g) a general room or building ventilation point;
(h) a food cooker or kitchen range;
(i) an acid or alkali tank;
(j) vents on fuel storage tanks which meet technology specifications acceptable to the Authority;
(k) hand-held or other portable cleaning, maintenance and construction equipment;
(l) extractive industry or mining operating in accordance with the Mineral Resources (Sustainable Development) Act 1990 .
(2) A licence under section 20(1) of the Act is not required with respect to discharges or emissions to air from boilers fired solely by natural gas with a total rated capacity of less than 20 megawatts.