(1) This Part does not apply to the sale in the second State of goods, or affect laws of the second State, for the time being declared by or under an Act or regulation of the State to be goods or laws to which this section applies.
(2) Any such exemptions have effect only if they are substantially for the purpose of protecting the health and safety of persons in the State or preventing, minimising or regulating environmental pollution (including air, water, noise or soil pollution) in the State.
(3) No such exemption operates (together with the period of any previous exemption) for longer than a period of 12 months or an aggregate period of 12 months.