简介: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 fro简介: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.详细>