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Background |
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Background |
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Studies have shown that poorly maintained petrol and LPG vehicles can emit up to 10 times more pollutants which worsen our roadside air quality.
To further improve our roadside air quality, from 1 September 2014 onwards, the Government implemented a new strengthened vehicle emissions control regime for petrol and liquefied petroleum gas (LPG) vehicles to enforce vehicle emission standards of carbon monoxide, hydrocarbons and nitrogen oxides. |
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Implementation Details |
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EPD deploys mobile remote sensing equipment at roadsides to identify petrol and LPG vehicles with excessive emissions without stopping them.
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 ↑Real-time capture of emissions of vehicle in motion |
↑ Hong Kong Transient Emission Test on Chassis Dynamometer at a Designated Emission Testing Centre |
If a vehicle is found to have exceeded its applicable emissions standard, the owner will receive an Emission Testing Notice (ETN) and must have the vehicle tested and passed a transient-dynamometer-based emission test at a Designated Vehicle Emission Testing Centre (DVETC) within 12 working days.
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Failure to comply with the requirement will lead to cancellation of the vehicle licence by the Commissioner for Transport. |
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Vehicle Emissions Standard |
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| The following types of vehicles running on petrol or LPG and manufactured in or after 1975 need to meet the applicable vehicle emission standards: | |
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Petrol private cars |
LPG / petrol taxis |
Download Area |
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| For Vehicle Owners: | ||
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| Poster | Leaflet | Promotion Video |
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| Vehicle Emission Standard (Petrol, LPG & Hybrid Vehicles) | ||
| For Vehicle Repair Mechanics: | ||
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| Technical Guideline on Vehicle Emission Standards and the Hong Kong Transient Emission Test on Chassis Dynamometer (Chinese version only) | Hong Kong Transient Emission Test on Chassis Dynamometer (Petrol and LPG Vehicles) Technical Seminar - Presentation (9-2014)(Chinese version only) | Hong Kong Transient Emission Test on Chassis Dynamometer (Petrol and LPG Vehicles) - Lambda(Chinese version only) |
| For Operators of Designated Vehicle Emission Testing Centre (DVETC): | ||
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| Code of Practice for DVETC | Application Form for DVETC | |
Frequently Asked Question |
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- The owner needs to pay a fee of $620 for each test done at the DVETC.
- The vehicle emission standard is set according to the design standard which varies with the year of manufacture of the vehicle. The limits are two times of that in the design standard.
- Vehicles found to emit excessively by the remote sensing equipment must be tested at a DVETC. This test CANNOT be replaced by TD's exhaust emission test in annual examination for licence renewal.
- The exhaust emission test in annual examination for determining vehicles’ roadworthiness required by TD for annual licence renewal measures the concentration of carbon monoxide emitted by a vehicle (as well as hydrocarbons concentration in case of LPG vehicles) under idling status and cannot reflect the emission performance of a vehicle, in particular nitrogen oxides, in real driving conditions when its engine is loaded. On the other hand, an excessively emitting vehicle identified by the remote sensing equipment has to conduct the Hong Kong Transient Emission Test on Chassis Dynamometer simulating real driving conditions to measure the emissions of nitrogen oxides, hydrocarbons and carbon monoxide for ascertaining whether the vehicle complies with its emission standards. Thus, TD’s exhaust emission test in annual vehicle examination is not equivalent to EPD's Hong Kong Transient Emission Test on Chassis Dynamometer.
- Considering that excessively emitting vehicles accounted for only a small portion of LPG and petrol vehicle fleets, it is not recommended to incorporate the Hong Kong Transient Emission Test on Chassis Dynamometer into TD’s annual examination, as it will significantly increase the test fee of annual examination and affect the entire fleet. Thus, only those vehicles found to emit excessively are required to conduct the Hong Kong Transient Emission Test on Chassis Dynamometer at the DVETC.
- If you receive an ETN, it means your vehicle has been identified to be emitting excessively. You should repair your car promptly and take your vehicle to a DVETC for a transient-dynamometer-based emission test before the deadline as stated on the ETN. You may contact EPD and apply in writing for extension of emissions test due date if you have practical difficulties in passing the emissions test as required on the ETN.
- Not necessarily. Vehicles emit various regulated pollutants while driving. Addressing only the emission issues of the pollutant mentioned in the “Emission Testing Notice” and ignoring potential issues with other regulated pollutants cannot ensure that the vehicle will pass the “Hong Kong Transient Emission Test on Chassis Dynamometer”.
- For those vehicles manufactured in the 1990s and after, the emission control systems are relatively complicated. All emission control components should function properly and be well-coordinated, otherwise emissions may become unstable. Additionally, when one type of pollutant is excessively emitted, it may chemically react with the other pollutants and these pollutants with reduced concentration might not be detected under the remote sensing measurements. If the vehicle undergoes partial repairs or engine adjustments before undertaking the “Dyno Test”, these pollutants previously not detected under the remote sensing measurements might be found out by the “Dyno Test”, causing different results between the “Dyno Test” and remote sensing measurement. Therefore, partial repairs or mere engine adjustments are unlikely to resolve the overall vehicle emission issues. To effectively address vehicle emission problems, the Environmental Protection Department recommends that vehicle owners should hire competent technicians for regular and comprehensive vehicle inspections.
- Roadside remote sensing measurement and the “Hong Kong Transient Emission Test on Chassis Dynamometer”, commonly known as the “Dyno Test”, may yield different results regarding which pollutant(s) is (are) being emitted excessively. This does not imply that the EPD's roadside remote sensing measurement is inaccurate.
- Roadside remote sensing measurement aims to identify vehicles with excessive emissions from a large number of vehicles. These excessively emitting vehicles are then required to undergo a more comprehensive emission test, known as “Dyno Test”.
- The EPD's remote sensing equipment is designed and manufactured according to international standards. The remote sensing measurement data has undergone multiple quality assurance procedures to ensure that the EPD will not issue the “Emission Testing Notices” to vehicle owners whose vehicles without exceeding the emission limit. The “Dyno Test” is a comprehensive emission measurement method that can simulate the vehicle's driving condition on road and measure the vehicle's emissions during the “Dyno Test”. Therefore, the “Dyno Test” may identify other excessive pollutants that roadside remote sensing equipment, which measures emissions in a snapshot, could not detect.
Enquiry Hotline: 3619 6610