In hopes of creating a standardized measurement system, CASS has developed and modularized a sensor suite for temperature and relative humidity integrated to the UAS’s autopilot system and GPS. Such integration provides a single source of timestamp and position for any data point acquired and ensures data comparability across platforms. Here we present the challenges faced and solutions adopted to integrate a fast response non-dispersive infrared (NDIR) CO2 sensor (SenseAir K30) to the current UAV-mounted sensor suite, while expanding its modularity to allow data comparability across platform types (rotary- and fixed-wing aircraft). We conclude by comparing preliminary results of data acquired during the Lower Atmospheric Process Studies at Elevation a Remotely-piloted Aircraft Team Experiment, in San Luis Valley, CO and during the OU Kessler Atmospheric and Ecological Field Station campaigns in Washington, Oklahoma, to non-integrated data acquired during the Innovative Strategies for Observations in the Arctic Atmospheric Boundary Layer campaign in Hailuoto, Finland.