What were the actual concentrations found?
From the article it seems to me that most of the stuff they found is trace leftover degreaser, possibly due to production pressure and insufficient airing times.
This would be measureable, but hardly noticeable, especially with n-hexane, which gets you stoned when you hit the (EU) legal limit of 25 ppm (prolongued-exposure toxicity (associated with the nervous disorders) for n-hexane is lowest-value 500 ppm, 20 times over that limit..) I can't imagine those facories working with peeps working in fumes thick enough to have a measureable physical effect. There'd be a recall or two each week if you let your cheap labour get stoned on the job, and such...
Benzene itself is not as nasty as people will have it, actually. The problem is mostly with its metabolites in the human body ( which also occur naturally) which are rather nasty. Flooding your system with that stuff through benzene inhalation is definitely a bad idea, although you really still need to inhale quite a bit of the stuff to have serious effects. The MAC value for benzene is very low (<1 ppm), but you hit that value with a bit of splash of gasoline, or for that matter a nice walk in a pinewood.
Both substances can be nasty long-term if misused/applied, but other than the bruhaha about "Dangerous Suffz" from environmentalists they rate pretty low on the scale of "Stuff you don't want to be around in/with". Especially as far as benzene is concerned there's even chance the air in the factory is cleaner than outside, given the rather notorious smog problem.
I'm not one to jump to the defense of megacorps/factories, but this one comes across as a kneejerk reaction, without properly investigating the cause.