(1) In this Part:
authorised officer means an authorised officer appointed by the EPA.
excessive air impurities—see subsection (2).
mass—see subsection (3).
petrol includes a mixture of petrol and any other substance, other than a prescribed mixture or a mixture of a prescribed class or description.
prescribed anti-pollution device means a device specified or described in the regulations and described there as being a device designed or intended to minimise air pollution caused by motor vehicles.
unleaded petrol means petrol:(a) that contains:(i) no lead or not more than the prescribed mass of lead per litre, and(ii) no phosphorus or not more than the prescribed mass of phosphorus per litre, and(b) that has a research octane number within the prescribed range.(2) For the purposes of this Part, a motor vehicle emits excessive air impurities if:(a) when in operation, it emits as determined in accordance with the regulations, air impurities in excess of the standard of concentration and the rate (or the standard of concentration or the rate) prescribed in respect of the class of motor vehicles to which the motor vehicle belongs, or(b) when tested in the prescribed manner, it emits air impurities in excess of the amount per test prescribed in respect of the class of motor vehicles to which the motor vehicle belongs.(3) For the purposes of this Part, the mass of an element contained in a specific volume of a substance may be determined by reference to the mass of the element present as a constituent of a compound contained in that volume.