Nonsense! Tractor-trailer trucks have no emission standards, and belch a great deal of crud into the atmosphere. All of the VWs are a drop in the bucket by comparison.
Are you suuuuuuuuure about that? The manufacturers of Detroit Diesel, Cummins, Caterpillar and others may disagree after spending untold millions developing the anti-pollution devises the government has demanded to be incorporated into their engines. Untold millions.