Night-time chemistry of biomass burning emissions in urban areas: A dual mobile chamber 1 study

16 Residential biomass burning for heating purposes is an important source of air pollutants during 17 winter. Here we test the hypothesis that significant secondary organic aerosol production can take 18 place even during winter nights through oxidation of the emitted organic vapors by the nitrate 19 (NO 3 ) radical produced during the reaction of ozone and nitrogen oxides. We use a mobile dual 20 smog chamber system which allows the study of chemical aging of ambient air against a control 21 reference. Ambient urban air sampled during a wintertime campaign during night-time periods 22 with high concentrations of biomass burning emissions was used as the starting point of the aging 23 experiments. Biomass burning organic aerosol (OA) was on average 70% of the total OA in the 24 beginning of our experiments. Ozone was added in the perturbed chamber to simulate mixing with 25 background air (and subsequent NO 3 radical production and aging), while the second chamber was 26 used as a reference. Following

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