Monitoring of benzene, toluene, ethylbenzene, xylenes (BTEX) and other hydrocarbons in the ambient air. Synspec GC955 601 gas chromatograph (GC) is built specifically for the measurement of BTEX in ambient air. It can be utilised to simultaneously detect and measure up to 40 different components. The settings of the system can be also customised to include specific components that the client needs to measure.