US auto maker Dodge is to equip its large diesel pick-up models with new emissions technology, in response to new, stricter federal laws regulating fumes.

According to Automotive News, a diesel particulate filter and oxides of nitrogen adsorber will be added to its Ram model, in order to adhere to the stringent rules that come into effect in 2007.

One supplier told the trade publication that the particulate filter will cost the firm between $600 and $800.

"The Ram requires an all-new emissions control system and significant changes to the engine," said Frank Klegon, the Chrysler group's executive vice president for product development.

General Motors and Ford are also thought to be making changes to their large diesel vehicles in response to legislation, set out by the US Environmental Protection Agency.

Changes will also have to be made to diesel fuel available at the pumps.

The precious metal particulate filters cannot function properly when high-sulphur diesel fuels are used, meaning low-sulphur diesel will have to become more widely available in US pump stations.

The new fuel has about 15 parts per million of sulphur, compared to current diesel that contains 500 parts per million of sulphur.

Ÿ Adfero Ltd