CO2 in outdoor air, does EnergyPlus account for this

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I am going to model a zone and report the CO2 levels. I want to make sure I include all CO2 that might be entering the space. I have a natural ventilation strategy, modeled using the Air Flow Network models in E+, and so it is important to include any CO2 that might be entering from the outdoor air.

• Does anyone know if EnergyPlus includes CO2 levels when introducing outdoor air into the space?
• If it doesn't normally, is there a way to include this?
• And finally if it does, where does EnergyPlus get this data from?

As always many thanks to anyone who answers my queries, this is turning out to be a very useful site!