Negativ interferens forekommer ligeledes i NDIR-enheder, når den interfererende gas udvider absorptionsbåndet for den målte gas, samt i CLD-enheder, når den interfererende gas dæmper reaktionen. ###>Negative interference occurs in NDIR instruments by the interfering gas broadening the absorption band of the measured gas, and in CLD instruments by the interfering gas quenching the reaction.