Unlike diesel exhaust engines that contain potentially harmful components such as particulate matter (PM), carbon monoxide (CO), hydrocarbons (HC), oxides of nitrogen (NOx) and oxides of sulfur (SOX), Tier 4 engines significantly reduce particulate matter and NOx emissions.
Non-road diesel engines were identified as a significant source of air pollutants and greenhouse gas emission in Australia, due to their low uptake of emission control technology. The World Health Organisation’s International Agency for Research on Cancer has even identified fine-particle emissions from diesel exhaust as a carcinogen once it has been inhaled into the lungs.
The Tier 4 engines aim to minimise this risk on site by keeping up with today’s US and EU ‘tiers’ or ‘stages’ of emission standards.