PERMITTED PERIODS OF DARK SMOKE REGULATIONS

PERMITTED PERIODS OF DARK SMOKE

SUBSIDIARY LEGISLATION 200.01

PERMITTED PERIODS OF DARK SMOKE

REGULATIONS

15th April, 1969

LEGAL NOTICE 28 of 1969.

The title of these Regulations is Permitted Periods of Dark

Smoke Regulations.

Words and phrases used in these regulations shall have the

same meaning as is assigned to them in the Clean Air Act,

hereinafter referred to as "the Act".

(1) Emissions of dark smoke from any chimney (not being

a chimney of a vessel) for not longer than ten minutes in the

aggregate in any period of eight hours, or, if soot-blowing is carried

out within any such period, for not longer than fourteen minutes in

the aggregate in that period, shall be left out of account for the

purposes of article 3 of the Act.

(2) The said periods of ten minutes and fourteen minutes shall

be increased -

(a) in the case of a chimney serving two furnaces, to

eighteen

minutes

and

twenty-five

minutes

respectively;

(b) in the case of a chimney serving three furnaces, to

twenty-four minutes and thirty-four minutes

respectively; and

(c) in the case of a chimney serving four or more furnaces,

to twenty-nine minutes and forty-one minutes

respectively.

(3)

Nothing in the preceding sub-regulation shall authorise -

(a) the continuous emission of dark smoke, caused

otherwise than by soot-blowing, for a period

exceeding four minutes, or

(b) the emission of black smoke for more than two

minutes in the aggregate in any period of thirty

minutes.

(4) For the purposes of this regulation, where a single boiler or

unit of industrial plant is fired by more than one furnace

discharging to the same chimney, all those furnaces shall be

deemed to be one furnace.

(5) In this regulation, "black smoke" means smoke which, if

compared in the appropriate manner with a chart of the type known

at the date of enactment of the Act as the Ringelmann Chart, would

appear to be as dark as or darker than shade 4 on the Chart.