Blue Air is a non-toxic aqueous 32.5% urea solution used to chemically reduce NOx emissions from heavy-duty diesel-powered vehicles. It is not a dangerous good, nor harmful to the environment, and is classified in the minimum-risk category of transportable fluids. Hi-Tec Blue Air can simply be washed off with water should it be spilled on an operator’s hand.
Blue Air is neither a fuel nor a fuel additive and needs to be used in a dedicated tank on the heavy-duty vehicle. It is replenished in a similar way to refueling diesel (about 4-5% by volume of diesel consumption for ADR 80/01 and about 5-6% for ADR 80/02).
There are different vehicle emission standards around the world, setting specific emission limits for the four main pollutants: Oxides of Nitrogen (NOx), Particulate Matter (PM), Carbon Monoxide (CO), and Hydrocarbons (HC). The use of SCR and Blue Air technology addresses the NOx component of these standards and commenced with the introduction of Euro IV.