About 2,000 lorries from here may be barred from entering Singapore from July 17 if the Malaysian Government does not take immediate steps to reduce the sulphur content in diesel. From that date, the Singapore Government will not allow diesel-engine vehicles emitting fumes above 75 Hartridge Smoke Units (HSUs) on its roads. Unfortunately for Malaysian lorry owners, the sulphur content in diesel sold here is likely to cause the vehicles to emit smoke above the permissible level.