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Emissions Control Systems Manufacturers

The following links will lead you to emissions control systems manufacturers for retrofit applications:
BASF Catalysts
Ceram Catalysts
Corning
Emitec
Ibiden
Johnson Matthey
NGK
Rhodia Electronics and Catalysis
Saint-Gobain
Umicore

Air Quality

To compare the current air quality in different European cities:
Current Air Quality in Europe

Low Emission Zones

To find Europe-wide information on LEZ:
Low Emissions Zones in Europe

Retrofit Worldwide

Other parts of the world also retrofit to reduce the pollution from existing vehicles
USA retrofit manufacturers
USA forum on diesel retrofit
Arbeitskreis Partikel-Filter-Systemhersteller
Schweizer Partikelfilter Verband
United Nations Environment Programme - Toolkit for clean Fleet Strategy Development

Diesel Engines and Diesel Emissions

Online information service on clean diesel engines and diesel emissions
Dieselnet
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