An explanation of the abbreviations, technical terms and specialist language used on our website

ASC Ammonia Slip Catalyst
BACT Best Available Control Technology
CARB California Air Resources Board
CH4 Methane
CNG Compressed Natural Gas
CO Carbon monoxide
CO2 Carbon dioxide
CRTÒ Continuously Regenerating Technology
CSR Corporate Social Responsibility
DOC Diesel oxidation catalyst
DPF Diesel particulate filter
ECT Emission Control Technologies
EHS Environment, health and safety
EU European Union
GHG Greenhouse gas
GWP Global warming potential
HAPs Hazardous Air Pollutants
HC Hydrocarbon
HDD Heavy Duty Diesel
HFO Heavy Fuel Oil
ISO 14000 Internationally recognised series of standards which specify the requirements for an environmental management system
ISO 26000 International standard giving guidelines on social responsibility
ISO 9000 Internationally recognised series of standards which specify the requirements for a quality management system
KPI Key performance indicator
LPG Liquefied Petroleum Gas
LSD Low sulfur diesel
MACT Maximum Achievable Control Technology
MATS Mercury Air and Toxics Standards
MDO Marine diesel oil
N2O Nitrous oxide
NG Natural gas
NGO Non-governmental organisation
NMHC Non-methane hydrocarbon
NMNEHC Non-methane non-ethane hydrocarbon
NOx Oxides of Nitrogen: NO and NO2
PGM Platinum Group Metal
PM Particulate Mass (diesel soot) composed of solid carbon, ash, SOF and possibly sulfates
PTA Purified Terephthalic Acid 
R&D Research and Development
REACH Registration, Evaluation and Authorisation of Chemicals. EU chemical control legislation which came into force in June 2007
RICE NESHAP Reciprocating Internal Combustion Engine National Emission Standards for Hazardous Air Pollutants
SCR  Selective Catalytic Reduction 
SCRT SCR + CRT technologies integrated into a single system
SEC Stationary Emissions Control
SMR Steam Methane Reforming
SNG Substitute natural gas
SO2 Sulphur dioxide
SOF Soluble Organic Fraction (of diesel PM)
SOx Oxides of Sulfur
Syngas, synthesis gas A mixture of hydrogen, CO and CO2
TWC Three-way catalyst
ULSD Ultra Low Sulfur Diesel fuel
VOC Volitile Organic Compound
WtE Waste to Energy