Do you know why CNG vehicles don’t need an emission control system?

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At a time when the population and governments are increasingly committed to the fight against climate change, it makes sense that owners of heavy trucks, which are responsible for a large amount of emissions, should be forced to take measures to reduce them.

One way to reduce the amount of pollutants released from a heavy truck is to install an emission control system. However, trucks running on compressed natural gas do not require one. Find out why.

The emission control system: meeting the requirements of the PIEVAL

The PIEVAL is the Heavy Motor Vehicle Inspection and Maintenance Program. This program, led by the Government of Quebec, aims to fight climate change and improve air quality, particularly in urban areas, by reducing emissions of particulate matter, volatile organic compounds (VOCs) and carbon monoxide (CO) from heavy vehicles.

Under penalty of fines of up to $200,000, owners must ensure that their heavy-duty diesel trucks are equipped with an emission control system that limits particulate emissions (unless they already meet the required standards).

Natural gas trucks are clean vehicles

Since compressed natural gas is a cleaner fuel than diesel, the emissions from CNG vehicles are very low. They therefore meet the maximum emission standards for fine particulate matter and nitrogen oxides, even without the installation of an emission control system.

CNG trucks emit few fine particles

Heavy diesel trucks emit fine particles that affect air quality and consequently human health. They must therefore be equipped with a diesel particulate filter to meet the requirements of the PIEVAL. This particulate filter (or PAF) is designed to retain the fine particles, which are carcinogenic to humans, contained in the combustion gases. These soot particles are mainly composed of carbon and have a size between 10 nm and one micrometer.

Since compressed natural gas produces very little residue during combustion, the use of CNG as a fuel reduces almost all of a vehicle’s fine particulate emissions. For this reason, it is not necessary to install a PAF on a compressed natural gas truck.

CNG engines emit 25% less greenhouse gases than diesel engines

Nitrogen oxides (NOx) are gases emitted by most internal combustion engines. They are known to be responsible for smog and contribute to global warming.

It may be necessary to install a selective catalytic reduction system on some heavy vehicles to reduce the amount of nitrogen oxides emitted and comply with environmental standards. This system uses urea as one of its main components and converts nitrogen oxides into nitrogen and water, both of which are harmless.

However, even without a selective catalytic reduction system, CNG vehicles can operate on Quebec roads without fear of non-compliance with the requirements of the PIEVAL. This is because their NOx emissions are much lower than those of diesel trucks.

Choose CNG and ensure you meet environmental standards

And there you have it, there is no need to install an emission control system on CNG heavy trucks to comply with regulatory requirements from the government.

If you don’t want to be forced to invest in the installation of emission control systems, invest in clean technology instead! Contact the EBI team and choose compressed natural gas over traditional fuel.