全天候、在线监测环境空气中的烃类（从乙炔到三甲苯）

The presence of volatile hydrocarbons in urban atmospheres is believed to contribute to the formation of ground-level ozone, one of the main constituents of urban smog. The compounds of interest range in volatility from acetylene (ethyne) to trimethylbenzene, and are generally referred to as ozone precursors. Vehicle emissions are thought to be the main source of these compounds. Recent European and US regulations [1,2] require round-the-clock monitoring of target species in all major urban centers to establish and monitor the link between periods of high traffic density and high pollution levels (key compounds include benzene, toluene, xylene, and buta-1,3-diene). Continuous real-time monitoring provides an insight into emission episodes from local industry, and can be used to monitor the effect of weather conditions such as wind direction, precipitation, and temperature inversion.