Accuracy in calculation of average emissions must be ensured to see that the models give practical outputs.
If you mean the variability of the fleet composition?
This has huge effects on the emission. In developing countries where the fleet technologies range widely from pre-Euro to Euro3, 4 (commonly), a small fraction of pre-Euro diesel vehicles in the fleet can contribute most of the BC and PM emission. In our study for Kathmandu city we found buses of 47 years old that contribute hugely to BC emission. A simple arithmetic average can not be used in this situation. A weighted average EF was produced to estimate the emission for Kathmandu.
If you are looking for variability in the fleet than we calculate the weighted emission factor (One representative emission factor for whole fleet.) because of large variability in the fleet composition in developing countries like India. If doing some study in context of India, then u can go for average Emission factors provided by ARAI, Pune which covers almost all categories of vehicles plying on indian roads. these emission factors are based on indian driving cycle.
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