Nitrogen is thought to be in the form of molecular nitrogen with the remainder

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possibly representing mineralized ash (10%) and high-molecular-weight compounds containing substantial amounts of nitrogen (Lobert et al., 1991; Yokelson et al., 1996). It is unclear whether these latter compounds might act as a source of NO^ or NOx to the remote troposphere. Of the known fixed nitrogen compounds, NOx is the dominant species (54%), having an estimated emission factor of approximately 2.1 gN/kgC (carbon fuel). This is significantly smaller than the emission factors reported for higher temperature fossil fuel combustion sources. Reduced nitrogen compounds such as NH3 (emission factors of approximately 1.3 gN/kgC) comprise the remaining 46%.

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