Bad fumes entering the car can't stand it tried everything, dealer said that is the way the new cars are, and said government law so no one gets asphyxiated on recirculating mode, I think it's Bull Sh*t, if anything, you can get carbon monoxide poisoning from all the outside exhaust fumes.

Started when cold weather arrived first while sitting in traffic, a car next to me with any kind of emission issues would enter cabin which would force you to open windows fast. Same problem on highway pulling in fumes from car or trucks just ahead when outside air is set in recirculation or automatic mode. Service department says running normal full flow air operation in cabin you have to expect fumes and odors .