I think what you want to do would probably cost you some money. Were not too concerned with emissions around here. You probably need a special highly advanced machine to read exact amounts of C02. Now I know that there are devices that can test for the presence of C02 but getting one that actually reads and records the amounts is gonna cost big bucks. I would suggest doing something else for a senior project. Nice idea though. But really who cares about CO2 ?
My senior project consists of building my 98 GT, to meet performance, emissions, gas mileage, and handling of a new sports car. Thats why I kinda need to get it tested. Do regular shops have this machine or no?