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Boreal forest fires are currently recognized as a significantfactor in climate change and air quality problems. Although emissions ofbiomass burning products are widely measured in many regions, there is stilllack of information on the composition of wildfire emissions in Siberia, aregion known for its severe wildfire activity. Emission ratios (ERs) areimportant characteristics of wildfire emissions as they may be used tocalculate the mass of species emitted into the atmosphere due to combustionof a known mass of biomass fuel. We analyze observations of carbon dioxide(CO2), carbon monoxide (CO), methane (CH4), totalnonmethane hydrocarbons (NMHCs), nitrogen oxides NOx( =  NO + NO2), particulate matter (PM3), and black carbon(BC) within two forest fire plume transects made by the moving railwayobservatory during TRanscontinental Observations Into the Chemistry of theAtmosphere (TROICA) expeditions. Slopes in linear regressions of excesslevels of the pollutants are used to obtainERCO ∕ CO2 = 10–15 %,ERCH4 ∕ CO = 8–10 %,ERNMHC ∕ CO = 0.11–0.21 % ppmC ppmC−1,ERNOx ∕ CO = 1.5–3.0  ppb ppm−1, ERPM3 ∕ CO = 320–385 ng m−3 (µg m−3)−1, and ERBC ∕ CO =  6.1–6.3 µg m−3 ppm−1, which fall within the range of uncertainty of theprevious estimates, being at the higher edge for ERCH4 ∕ CO, ERNMHC ∕ CO, and ERPM3 ∕ CO and at the lower edge for ERNOx ∕ CO. The relativeuncertainties comprise 5–15 % of the estimated ERCH4 ∕ CO,ERNMHC ∕ CO, and ERPM ∕ CO and 10–20 % ofERNOx ∕ CO,ERCO ∕ CO2, andERBC ∕ CO. The uncertainties are lower than inmany other similar studies and associated mainly with natural variability ofwildfire emissions

Emission ratios of trace gases and particles for Siberian forest fires on the basis of mobile ground observations