Volatile organic Compounds (VOC).There are many kinds of VOCs, but it is impossible to monitor and regulate all vocs. Therefore, some domestic indicators are used to characterize VOC, such as VOCs, TVOC, non-methane total hydrocarbons and hydrocarbons.
VOC: VOC in the general sense is the command of organic compounds.But the definition in the sense of environmental protection refers to a kind of volatile organic compounds that are active, that can produce harm.
TVOC: The various vocs measured are collectively known as total volatile organic compounds (TVOCs).Mainly refers to indoor common VOC and indicators.
VOCs: Organic compounds that are volatile under specified conditions.It is defined in detail as organic compounds whose saturated vapor pressure is greater than 133.32 Pa at room temperature. And whose boiling point is below 50~260℃ at normal pressure, or any organic solid or liquid. That can volatilize at room temperature and pressure.
Non-methane total hydrocarbon refers to all hydrocarbons except methane. Including alkanes, alkenes, aromatic hydrocarbons and oxygen-containing hydrocarbons.
Hydrocarbons, including THC and NHMC, are used in the automotive industry.
VOCs governance why more attention?
It is an important precursor of PM2.5 and ozone.The atmospheric compound pollution with particulates and ozone as the characteristic pollutants is in a serious situation in China.On the one hand, PM2.5 is the primary pollutant affecting the atmospheric environment, followed by ozone.On the other hand, ozone has become the only pollutant not falling. But rising among the six basic environmental air quality evaluation items since the implementation of the "Ten Rules for Atmosphere" in 2013. And VOCs is an important precursor of the two, VOCs emission intensity is higher. And PM2.5, ozone concentration high value area distribution is basically consistent.