Interactive comment on “Combustion efficiency and emission factors for US wildfires” by

The manuscript presents so far unpublished high-quality aircraft measurements of CO2, CO and CH4 from three large wildfires and one prescribed fire in mixed conifer forests of the northwestern United States. From these measurements, the author calculates emission factors (EF) for these species and analyses the relationship between observed modified combustion efficiency (MCE) and EFCH4. The author uses fuel consumption and MCE measurement data from 18 prescribed fires described in literature to statistically explore the linear relationship between the ratio of heavy fuels consumption and MCE. By combining the average MCE measured in this study with linear EF-MCE relationships found for temperate conifer-dominated forests in other studies, wildfire EF for 14 additional species are estimated. The author concludes that fuel composition is an important driver of variability in MCE and EF, and that wildfires, due to a higher fraction of large diameter fuels consumed, predominantly burn with C243