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Powered By: The Straits Times
08 Mar 2017 | Local News : Singapore

Inspection standards for petrol vehicles are set to tighten from April 2018, with stipulated lower carbon monoxide emissions and a new hydrocarbons cap.


Owners of petrol vehicles will have to maintain their cars and bikes regularly if they are to pass regular inspections next year. From 1st April 2018, most of these vehicles will have to emit less carbon monoxide than now, and will have to meet a new hydrocarbons cap.

Existing vehicles will be able to meet the heightened inspection standards as long as they are well maintained with proper and regularly servicing
For instance, any car registered between 1st January 2001 and 31st March 2014 currently cannot have more than 3.5 percent of carbon monoxide in its emission. This cap will be lowered to one percent from April next year. On top of that, the emission cannot contain more than 300 parts per million (ppm) of hydrocarbons, a byproduct of imperfect combustion.

For cars registered from 1st April 2014, the standards are even higher - a carbon monoxide composition of no more than 0.3 percent, and a hydrocarbon make-up of no more than 200ppm at an engine speed of 2,000rpm.

Motorcycles registered between 1st July 2003 and 30th September 2014 will also have to meet a hydrocarbons cap - 7,800ppm and 2,000ppm for two-stroke and four-stroke models, respectively. The hydrocarbons cap for those registered from 1st October 2014 will be even lower at 1,000ppm. On top of that, these newer models cannot have more than three percent of carbon monoxide in their exhaust gases, down from 4.5 percent now.

For diesel vehicles, the National Environment Agency (NEA) said the current smoke opacity test will continue to apply. The opacity test was last tightened in 2014, from 50 Hartridge Smoke Units (HSU) to 40 HSU.

Explaining the difference in test treatment, the NEA said petrol vehicles generally emit more carbon monoxide and hydrocarbons while diesel vehicles generally emit more smoke (a proxy for particulate matter). "This is in accordance to international practices on testing of emissions from in-use vehicles," it added. The Straits Times understands that existing vehicles will be able to meet the heightened inspection standards as long as they are well maintained with proper and regularly servicing.
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