Shanghai police have begun an investigation into a clothing firm after toxic dye was found in school uniforms, state media reports.

BBC: Shanghai police probe 'toxic' school uniforms

Toxic particles in cigarette smoke can remain on nearby surfaces, as well as the hair and clothing of the smoker, long after the cigarette has been put out, and small children are susceptible because they are likely to breathe in close proximity, or even lick and suck them.

BBC: Warning over 'third-hand smoke'