Recent addition of Benzene in petrol, in place of a lead compound, has made Benzene and its derivatives a part of vehicular pollution. Already Benzene concentrations in high traffic areas and near petrol pumps have become a matter of concern. Unfortunately a majority of these compounds are highly toxic and many have been reported to be carcinogenic. Organic compounds are also reported to be pre-cursers for Ozone formation and play a role in secondary formation of oxidants. As such air pollution monitoring networks are now beginning intensive efforts for monitoring of specific organic compounds such as Benzene, Toluene & Xylene and often a mixture of Total Non Methane Hydrocarbons.

In keeping with its tradition of working in the forefront of pollution measurement technology Envirotech had made an Organic Vapour Sampler (APM 850) several years ago. The APM 856 Organic Vapour Sampler has evolved from the experiences gained and the feedback received from the users of the APM 850 and now provides a system which meets all important requirements for field measurements of gaseous organic pollutants in ambient air.