Air board has allies in diesel pollution crackdown: Truckers

Yup.  Now they're turning on one another.

"Companies have invested millions of dollars only to be undercut by carriers that are choosing not to comply because they figure they won't get caught," said Michael Shaw, a spokesman for the California Trucking Assn. "Without additional investment in enforcement ... there's little chance the Air Resources Board is going to do more than scratch the surface."

The article says that the diesel can be attributed to 85% of air pollution cancer risk.  I think that is a load of crap.