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Diesel Manufacturers Fighting Pollution Standards

Diesel engine manufacturers are asking a Sacramento judge to block stricter pollution standards set to take effect in one week.

They argue that state regulators reneged on a $1 billion 1998 legal settlement.

The California Air Resources Board says the pollution standards it adopted in December are needed because a voluntary program promoted by manufacturers wasn´t working.

The judge tentatively denied manufacturers´ request, but did not immediately issue a final order.

The air board says removing so-called “smog defeat” devices from California-registered trucks alone would trim air pollution the same as removing a million cars from California highways.