Could breathing car exhaust trigger a stroke?

[Comment:  Exhaust emissions have also been linked to asthma.]

 

Could breathing car exhaust trigger a stroke?
http://www.nlm.nih.gov/medlineplus/news/fullstory_100433.html

"A Danish study hints that air pollution from car exhaust might trigger strokes, although much more study is needed to confirm this, the study team notes."