‘Benzene evaporates easily, and most people can just detect its distinctive smell at concentrations between 2.5 and 5 parts per million (ppm) in air.’ (hse.gov.uk/pubns/indg329.… [PDF])
‘Benzene evaporates easily, and most people can just detect its distinctive smell at concentrations between 2.5 and 5 parts per million (ppm) in air.’ (hse.gov.uk/pubns/indg329.… [PDF])
