[SkyPup]

No problem, it sounds to be like you are suffering the effects of nitrogen oxides commonly known as smog.

Yes, the best way is to reroute the exhaust exit pipe further out and away from your cab and to patch any and all leaks anywhere from the exhaust manifold out to the end of the tailpipe. Sealing off any interior air leaks in the cab is also a good idea, duct tape would be adequate for that task.