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The observations collected during the BOReal forest fires on Tropospheric oxidants over the Atlantic using Aircraft and Satellites (BORTAS) campaign in summer 2011 over Canada are analysed to study the impact of forest fire emissions on the formation of ozone (O3) and total peroxy nitrates ∑PNs, ∑ROONO2). The suite of measurements on board the BAe-146 aircraft, deployed in this campaign, allows us to calculate the production of O3 and of  ∑PNs, a long-lived NOx reservoir whose concentration is supposed to be impacted by biomass burning emissions. In fire plumes, profiles of carbon monoxide (CO), which is a well-established tracer ofpyrogenic emission, show concentration enhancements that are in strongcorrespondence with a significant increase of concentrations of ∑PNs,whereas minimal increase of the concentrations of O3 and NO2 is observed. The ∑PN and O3 productions have been calculated using the rate constants of the first- and second-order reactions of volatile organic compound (VOC) oxidation. The ∑PN and O3 productions have also been quantified by 0-D model simulation based on the Master Chemical Mechanism. Both methods show that in fire plumes the averageproduction of ∑PNs and O3 are greater than in the backgroundplumes, but the increase of ∑PN production is more pronounced thanthe O3 production. The average ∑PN production in fire plumesis from 7 to 12 times greater than in the background, whereas the averageO3 production in fire plumes is from 2 to 5 times greater than in thebackground. These results suggest that, at least for boreal forest fires andfor the measurements recorded during the BORTAS campaign, fire emissionsimpact both the oxidized NOy and O3,  but (1 ∑PNproduction is amplified significantly more than O3 production and (2) in the forest fire plumes the ratio between the O3 production and the ∑PN production is lower than the ratio evaluated in the backgroundair masses, thus confirming that the role played by the ∑PNs producedduring biomass burning is significant in the O3 budget. The implication of these observations is that fire emissions in some cases, for example boreal forest fires and in the conditions reported here, may influence more long-lived precursors of O3 than short-lived pollutants, which in turn can be transported and eventually diluted in a wide area

Production of peroxy nitrates in boreal biomass burning plumes over Canada during the BORTAS campaign