Suggest Remedy For Passive Smoking

During travelling on the road , I pass by many people smoking and I try not not to breathe at that time but after sometime , when I uncover my nose and breathe , then also the smoke remains there and I inhale the polluted air . So will it affect me . I don,t smoke but I am not able to find a solution for passive smoking . So what should I do . In many cases , some people after smoking come and talk to me and the smell is just unbearable and I cannot tell also about that and so I have to inhale the polluted breath . Being a non smoker , I have to worry and face such problems .