ARLA 32 Definition

ARLA 32 (Automotive Liquid Reducing Agent) is a chemical that acts to reduce the nitrogen oxide (NOx) emitted by vehicular exhaust gases. Reacting with these gases, ARLA 32 turns NOx into water vapor and nitrogen, gases that are harmless to human health. ARLA 32 allows the Euro V emissions standard, for engines fitted with the SCR technology (Selective Catalytic Reduction), to be met.

SCR requires the use of a reagent called AUS 32 (also known as AdBlue, DEF in North America or ARLA 32 in Brazil) to reduce the NOx.