1.   Whilst we can all look forward to cleaner diesel car exhaust the situation is sadly not so clear for trucks and buses.

2.   But Whitman also angered the oil and trucking industries when she upheld a Clinton rule demanding cleaner diesel trucks and buses.

3.   Cleaner diesel fuel would cost an extra four to six cents a gallon, the EPA estimates.

4.   Incentives to refiners that produce cleaner diesel fuel would boost production.

5.   They are the morning ban on construction equipment and a requirement for cleaner diesel equipment to be phased in sooner than federal rules will mandate nationally.

6.   Cleaner diesel trucks and buses can help states meet federal standards for reducing pollutants such as smog and small particles, Environmental Protection Agency Administrator Christie Whitman says.