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. Furans are emitted to the atmosphere during biomass burning fromthe pyrolysis of cellulose. They are one of the major contributing volatile organic compound (VOC) classes to OH and NO3 reactivity in biomass burning plumes. The majorremoval process of furans from the atmosphere at night is reaction with thenitrate radical, NO3. Here, we report a series of relative rateexperiments in the 7300 L indoor simulation chamber at Institut de Combustion Aérothermique Réactivité et Environnement, Centre national de la recherche scientifique (ICARE-CNRS),Orléans, using a number of different reference compounds to determineNO3 reaction rate coefficients for four furans, two furanones, andpyrrole. In the case of the two furanones, this is the first time thatNO3 rate coefficients have been reported. The recommended values(cm3 molec.−1 s−1) are as follows: furan, (1.49 ± 0.23) × 10−12; 2-methylfuran, (2.26 ± 0.52) × 10−11; 2,5-dimethylfuran, (1.02 ± 0.31) × 10−10;furfural (furan-2-aldehyde), (9.07 ± 2.3) × 10−14; α-angelicalactone (5-methyl-2(3H)-furanone), (3.01 ± 0.45) × 10−12; γ-crotonolactone (2(5H)-furanone), &lt;1.4 × 10−16; and pyrrole, (6.94 ± 1.9) × 10−11. The furfural + NO3 reaction rate coefficient is found tobe an order of magnitude smaller than previously reported. These experimentsshow that for furan, alkyl-substituted furans, α-angelicalactone,and pyrrole, reaction with NO3 will be the dominant removal process atnight and may also contribute during the day. For γ-crotonolactone,reaction with NO3 is not an important atmospheric sink.

atmospheric chemistry and physics

NO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; chemistry of wildfire emissions: a kinetic study of the gas-phase reactions of furans with the NO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; radical