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The above uncertainties lead to 33% overall uncertainty for ammonium and nitrate, 35% uncertainty for sulfate, and 37% uncertainty for organics. Transmission (TE) tests of ammonium nitrate particles have shown 100%±20% efficiency in the size range of 70-500 nm, with a significant fraction of the scatter being due to noise in these challenging experiments [Bahreini et al., 2008]. Considering a 10% uncertainty for TE increases the uncertainty to 34% for ammonium and nitrate, 36% for sulfate, and 38% for organics. This leads to uncertainty of 20-35% in total AMS mass, depending on the flight. When comparing AMS total mass to fine mass, we assume an uncertainty of 30% for the AMS total mass data.