There are two types of petrol vapour recovery systems which can be fitted at petrol stations. Petrol Vapour Recovery stage I controls (PVR I) reduce emissions of petrol vapour during the delivery of petrol from road tankers to petrol stations; and stage II controls (PVR II) which reduce emissions of petrol vapour during the refuelling of vehicles.
PVR I is required at all UK petrol stations with sales above 500 cubic metres of petrol a year. The PVR I controls should prevent all petrol vapour from this source escaping to the atmosphere. Statutory guidance reflects the mandatory requirements relating to the technical standards systems must meet when installed. The guidance also specifies the maintenance regime which must be carried out to ensure PVR I systems continue to operate effectively. Local authorities carry out periodic inspections of petrol stations to ensure compliance with the requirements.
Research has shown that PVR II systems under laboratory conditions can reduce emissions of petrol vapour to air by around 85 per cent. We are considering whether to require some petrol stations to install PVR II equipment.