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Error bars represent 95%% confidence intervals of the mean emission factor.

Mean emission factors and coefficients of variation estimated for the PME of each locomotive are shown in Table 5.

For each locomotive, per passenger-kilometer emission factors were estimated for every rail segment of 45 on-time duty cycles using the mean emission factors measured for each individual locomotive, for a total of 270 estimated duty cycle average emission factors.

Mean N2O N emission factors (EF5g) were higher than the most recent Intergovernmental Panel on Climate Change (IPCC, 2006) default value and more similar to the older IPCC (1997) values.

The mean NO x emission factor for F59PHI NC 1797 was 76%% higher than for NC 1755.

The range in the mean CO2 emission factors for the F59PHIs and F59PHs was 9 26 % of the average CO2 emission factor over the respective locomotive models.

The range in the mean NOx emission factors for F59PH locomotives was 0.37 g/pkm, or nearly 24%% of the average NO x emission factor of 1.57 g/pkm over the four locomotives.

For example, the range in mean NO x emission factors for individual F59PHs at Notch 8 is 0.97 g/s, or 20%% of the mean NOx emission rate over all F59PHs at Notch 8 of 4.76 g/s.

Activity emission factor.

CO2 emission factor, tCO2/MWh.

Exhaust e emission factor of locomotive l.