Abstract
In general, paint-solvents contain a large amount of volatile aromatic (VA) hydrocarbons above C7 (toluene), which give a large effect to urban atmosheric none methane hydrocarbons (NMHC) in Japan . The emissions of VA C9 hydrocarbons (VACS) from some types of industrial painting, paint making and printing processes were investigated besides those of VAC7 and VAC8 hydrocarbons (VAC7 ; VAC8). The percentages of VAC7-VAC9 in the NMHC emitted from these industrial processes changed as follows. (1) The percentages of VAC9 in the NMHC emitted from the painting processes on polymer film were very low (VAC9 average percentages= 6 .0%), while those of VAC7 and VAC8 were high (VAC7 average percentages=18.6%, VAC8 average percentages=40.4%). (2) In the NMHC emitted from the painting processes on metal board, the percentages of VAC8 and VAC9 were high (VAC8 average percentages=24.8%, VAC9 average percentages=27 .7%), while those of VAC7 were very low (VAC7 average percentages=4.3%). (3) The percentages of VAC7, VAC8 and VAC9 in the NMHC emitted from paint making processes were in good agreement with those observed at the painting processes described above . (4) The percentages of VAC7 and VAC9 in the NMHC emitted from printing processes were much lower than those of VAC8 (VAC8 percentages above 33.7%, VAC7 percentages below 2.2%, VAC9 percentages below 9.6%).
