What happens if foreign diesel vehicles exceed the new emission limit?

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Foreign Diesel Vehicles Exceeding New Emission Limits Will Be Denied Entry into Singapore

Foreign-registered commercial diesel vehicles failing to meet the new smoke emission limit of 50 Hartridge Smoke Units (HSU) or more will be turned back at Singapore's land checkpoints and refused entry into the country from April 1, 2026. This measure aims to align with the emission standards set forth in the Asean Framework Agreement on the Facilitation of Goods in Transit. Currently, vehicles emitting 60 HSU or more face similar restrictions.
New Emission Threshold Implementation

The revised threshold of 50 HSU for foreign commercial diesel vehicles will take effect on April 1, 2026. This change represents a tightening of current regulations, where vehicles emitting 60 HSU or more are already turned away. The National Environment Agency (NEA) has stated that this new standard is consistent with established Asean emission benchmarks.
Advisory Period for Foreign Vehicles

To ensure a smooth transition, Singapore's NEA will implement an advisory period for foreign commercial diesel vehicles. From October 1, 2025, to March 31, 2026, vehicles entering Singapore will receive advisories reminding them of the upcoming 50 HSU limit and the specific implementation date. This six-month period is intended to prepare vehicle operators for the stricter emission controls.
Current Enforcement Measures

Under the existing regulations, foreign commercial diesel vehicles with smoke emissions exceeding 60 HSU are already denied entry into Singapore at land checkpoints. For local and foreign vehicles that are tested and found to exceed 40 HSU, motorists are typically issued a composition fine. The upcoming changes in 2026 will lower the threshold for denial of entry for foreign commercial diesel vehicles to 50 HSU.

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What happens if foreign diesel vehicles exceed the new emission limit?

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