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i think you have tree major types of sensors too choose from.
1. the chemistry sensors, good for enviromental measurements. Thease sensors are not so expensive, but with a reduced lifetime. I think the first choise for air quality measurement.
2. the phyroelectric sensors, with a low price an a very large bandwith. You must use an aditional optical filter for your CO2 bandwith ~ 4,3 µm. And they are temperatur sensitiv.
3. the lead selenid sensors. Verry sensitiv with internal peltier cooler. The best choise for labaratory measurements in the low ppm range. But they are expensive.
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