Environmental Protection and Management (Air Impurities) Regulations

Status:

Current version
as at 02 Jun 2024

THE SCHEDULE

Regulation 4

Standards of Concentration of Air Impurities

1. The concentration of any substance specified in the first column emitted from any operation in any trade, industry, process, fuel burning equipment or industrial plant specified in the second column shall not at any point before admixture with air, smoke or other gases, exceed the limits specified in the third column.

Substance

Trade, industry, process, fuel burning equipment or industrial plant

Emission limits

(a)	Ammonia and ammonium compounds

Any trade, industry or process

30 mg/Nm³ expressed as ammonia

(b)	Antimony and its compounds

Any trade, industry or process

5 mg/Nm³ expressed as antimony

(c)	Arsenic and its compounds

Any trade, industry or process

1 mg/Nm³ expressed as arsenic

(d)

Benzene

Any trade, industry or process

5 mg/Nm³

(e)	Cadmium and its compounds

Any trade, industry or process

0.05 mg/Nm³ expressed as cadmium

(f)	Carbon monoxide

Any trade, industry, process or fuel burning equipment

250 mg/Nm³

(g)

Chlorine

Any trade, industry or process

32 mg/Nm³

(h)	Copper and its compounds

Any trade, industry or process

5 mg/Nm³ expressed as copper

(i)	Dioxins and furans

Any waste incinerator

(i)	1.0 ng TEQ/Nm³ for waste incinerators commissioned before 1st January 2001

(ii)	0.1 ng TEQ/Nm³ for waste incinerators commissioned on or after 1st January 2001

(j)	Ethylene oxide

Any trade, industry or process

5 mg/Nm³

(k)	Fluorine, hydrofluoric acid or inorganic fluorine compounds

Any trade, industry or process

10 mg/Nm³ expressed as hydrofluoric acid

(l)	Formaldehyde

Any trade, industry or process

20 mg/Nm³

(m)	Hydrogen chloride

Any trade, industry or process

200 mg/Nm³

(n)	Hydrogen sulphide

Any trade, industry or process

7.6 mg/Nm³

(o)	Lead and its compounds

Any trade, industry or process

0.5 mg/Nm³ expressed as lead

(p)	Mercury and its compounds

Any trade, industry or process

0.05 mg/Nm³ expressed as mercury

(q)	Oxides of nitrogen

Any trade, industry, process or fuel burning equipment

400 mg/Nm³ expressed as nitrogen dioxide

(r)	Particulate substances including smoke, soot, dust, ash, fly-ash, cinders, cement, lime, alumina, grit and other solid particles of any kind

Any trade, industry, process, fuel burning equipment or industrial plant (except for any cold blast foundry cupolas)

(i)	50 mg/Nm³; or

(ii)

where there is more than one flue, duct or chimney in any scheduled premises, the total mass of the particulate emissions from all of such flue, duct or chimney divided by the total volume of such emissions shall not exceed 50 mg/Nm³ and the particulate emissions from each of such flue, duct or chimney shall not exceed 100 mg/Nm³ at any point in time.

(s)	Styrene monomer

Any trade, industry or process

100 mg/Nm³

(t)	Sulphur dioxide (non-combustion sources)

Any trade, industry or process

500 mg/Nm³

(ta)	Sulphur dioxide (combustion sources)

Any trade, industry or process

(i)	1,700 mg/Nm³

(ii)	where there is more than one flue, duct or chimney in any scheduled premises, the total mass of the sulphur dioxide emissions from all of such flue, duct or chimney divided by the total volume of such emissions must not exceed 1,700 mg/Nm³ on a daily basis.

(u)	Sulphur trioxide and other acid gases

The manufacture of sulphuric acid

500 mg/Nm³ expressed as sulphur trioxide. Effluent gases shall be free from persistent mist.

(v)	Sulphur trioxide or sulphuric acid mist

Any trade, industry or process, other than any combustion process and any plant involving the manufacture of sulphuric acid

100 mg/Nm³ expressed as sulphur trioxide

(w)	Vinyl chloride monomer

Any trade, industry or process

20 mg/Nm³

[S 369/2015 wef 01/07/2015]

2. In this Schedule —

“dioxins and furans” means polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF), being tricyclic and aromatic compounds formed by 2 benzene rings which are connected by 2 oxygen atoms in PCDD and by one oxygen atom in PCDF and the hydrogen atoms of which may be replaced by up to 8 chlorine atoms;

“mg” means milligram;

“ng” means nanogram;

“Nm³” means normal cubic metre, being that amount of gas which when dry, occupies a cubic metre at a temperature of 0 degree Centigrade and at an absolute pressure of 760 millimetres of mercury;

“TEF” means Toxic Equivalency Factor;

“TEQ” means Toxic Equivalent, being the sum total of the concentrations of each of the dioxin and furan compounds specified in the first column of the table below multiplied by their corresponding TEF specified in the second column thereof:

Dioxin/Furan

TEF

2,3,7,8-Tetrachlorodibenzo-p-dioxin

1,2,3,7,8-Pentachlorodibenzo-p-dioxin

1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin

0.1

1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin

0.1

1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin

0.1

1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin

0.01

Octachlorodibenzo-p-dioxin

0.0001

2,3,7,8-Tetrachlorodibenzofuran

0.1

1,2,3,7,8-Pentachlorodibenzofuran

0.05

2,3,4,7,8-Pentachlorodibenzofuran

0.5

1,2,3,4,7,8-Hexachlorodibenzofuran

0.1

1,2,3,6,7,8-Hexachlorodibenzofuran

0.1

1,2,3,7,8,9-Hexachlorodibenzofuran

0.1

2,3,4,6,7,8-Hexachlorodibenzofuran

0.1

1,2,3,4,6,7,8-Heptachlorodibenzofuran

0.01

1,2,3,4,7,8,9-Heptachlorodibenzofuran

0.01

Octachlorodibenzofuran

0.0001

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