Welcome to the Sensirion SCD4x CO₂ Sensor product training module. This presentation will give an insight into indoor air quality measurement and demonstrate why monitoring CO₂ concentrations is vital for everyone’s well-being and health. Further, the SCD4x sensor series and the underlying built-in photoacoustic sensing technology PASens® are introduced and compared to typical NDIR CO₂ sensors. Finally, the available evaluation kit for easy sensor evaluation and prototyping is introduced.