AECC Association for Emissions Control by Catalyst

AESI Advanced Engine Systems Institute

American Coal Council

AWMA Air and Waste Management Association

CAPCOA California Air Pollution Control Officers' Association

CARB California Air Resources Board

CIMAC The International Council on Combustion engines

Clean School Bus

DieselNet

Diesel Technology Forum

EGSA Electrical Generating Systems Association

EPA Environmental Protection Agency - US Regulations

EPRI Electric Power Research Institute

European Union European Legislation

ICAC Institute of Clean Air Companies

IMO & MARPOL International Maritime Organization

Johnson Matthey Technology Review

MECA Manufacturers of Emission Controls Association

NAPPA National Association of Clean Air Agencies

NESCAUM The Northeast States for Coordinated Air Use Management

OTAQ Office of Transportation and Air Quality

SAE Society of Automotive Engineers International

SJVAPCD San Joachin Valley Unified Air Pollution Control District

TCEQ Texas Commission on Environmental Quality

USCADC: US Coalition for Advanced Diesel Cars

WPCA World Pollution Control Association