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. Ozone (O3), a potent greenhouse gas that is detrimental tohuman health, is typically found in elevated concentrations within biomassburning (BB) smoke plumes. The radical species OH, HO2, and RO2(known collectively as ROx) have central roles in the formation of secondarypollutants including O3 but are poorly characterized for BB plumes. Wepresent measurements of total peroxy radical concentrations ([XO2] ≡ [HO2] + [RO2]) and additional trace-gas andparticulate matter measurements from McCall, Idaho, during August 2018. Therewere five distinct periods in which BB smoke impacted this site. During BBevents, O3 concentrations were enhanced, evident by ozoneenhancement ratios (ΔO3/ΔCO) that ranged up to 0.06 ppbv ppbv−1. [XO2] was similarly elevated during some BB events.Overall, instantaneous ozone production rates (P(O3)) wereminimally impacted by the presence of smoke as [NOx] enhancements were minimal. Measured XO2 concentrations were compared to zero-dimensionalbox modeling results to evaluate the Master ChemicalMechanism (MCM) and GEOS-Chem mechanisms overall and during periods of BBinfluence. The models consistently overestimated XO2 with the base MCMand GEOS-Chem XO2 predictions high by an average of 28 % and 20 %,respectively. One period of BB influence had distinct measured enhancementsof 15 pptv XO2 that were not reflected in the model output, likely dueto the presence of unmeasured HOx sources. To the best of our knowledge, this is thefirst BB study featuring peroxy radical measurements.

atmospheric chemistry and physics

Ground-based investigation of HO&amp;lt;sub&amp;gt;&amp;lt;i&amp;gt;x&amp;lt;/i&amp;gt;&amp;lt;/sub&amp;gt; and ozone chemistry in biomass burning plumes in rural Idaho