Non-methane volatile organic compounds NMVOC

Scientific literature is full of studies estimating the emission factors for different types of vegetation and soils independent of controlling parameters such as temper- 

Most of the hydrocarbon flux from the biosphere to the atmosphere is just one compound, isoprene. Isoprene (HC=C (CH3)HC=CH2) is the building block of 

In addition to the important role biogenic terpenes play in gas-hase chemistry, their impact also extends to heterogeneous air chemistry. Although Went (1960) linked the formation of the blue haze over coniferous forests to the biogenic emission of 20 monoterpenes over 40 years ago, it was not until recently that terpenes received their due attention with respect to their role in secondary organic aerosol (SOA) formation. O Dowd et al. (2002) reported that nucleation events over a boreal forest were driven by the condensation of terpene oxidation products. Formaldehyde (HCHO) is a high-yield product of isoprene oxidation. The short photochemical lifetime of HCHO allows the observation of this trace gas to help constrain isoprene emissions (Shim et al. 2005). 

The annual global emission for isoprene and monoterpenes ranges from 250 to 450 and 128 to 450 Tg per year, respectively (Steinbrecher 1997, Moller 2003, and citations therein). By using HCHO column observations from the Global Ozone 

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Data from the EEA (2006c) reveal that air emissions from transport follow a slightly less expressed, but well comparable trend to entire emissions between 1990 and 2004. Table 19.2 shows the share for the transport sector of certain pollutants in the EU 40% to 50% of NO, and carbon monoxide (CO), 25% of non-methane volatile organic compounds (NMVOC) and just 1% of sulphur oxides (SO,). In developing countries, and here in particular in the big megacities, the share for transport of SO, heavy metal and particulate emissions (not listed here) will -because of the old vehicle fleets - be much higher. 

In this work atmospheric concentrations of a large number of non-methane volatile organic compounds (NMVOCs) emitted by different anthropogenic sources, in particular from traffic exhaust and solvent use, have been investigated. The results from the studies should provide more information about the relative importance of road traffic and solvent use to the total NMVOC emission in Europe. 

In contrast to the NOx mixing ratios 10-100 pptv in the clean lower atmosphere, those of NOx in the urban polluted air are t3 pically one to tens of ppbv, more than 100 times higher than the former (Finlayson-Pitts and Pitts 2000). Similarly, the mixing ratios of components of non-methane volatile organic compounds (NMVOCs) or non-methane hydrocarbons (NMHCs) in the polluted atmosphere, are also 0.1-100 ppbv, typically 100 times higher than 1-1000 pptv in the clean atmosphere (Finlayson-Pitts and Pitts 2000). In such a polluted atmosphere, most of the OH radicals formed by reactions (7.1) and (7.2) react with anthropogenic NHVOCs rather than CH4 and CO. 

Phwlowska, M., Czerwihski, J., St pniewski, W. 2008. Variability of the non-methane volatile organic compounds (NMVOC) composition in biogas from sorted and unsorted landfill material. Arch. Environ. Prot., 34(3) 287-298. 

During three measurement campaigns performed in September 2001, August/September 2002 and October 2003, non-methane volatile organic compounds concentrations were measured at different city areas in Wuppertal near relevant sources of NMVOCs. The... 

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