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This work presents an ongoing research aimed at interpreting the responses of non-selective gas sensors (such as metal oxide resistive ones) in terms of simple IF THEN rules. In particular, it is shown how a logical combination of the output of three extremely low-cost sensors, namely MQ131, MQ136 and TGS2602, can be arranged to produce IF THEN inferences able to discriminate among CO, SO 2 and NH 3 emissions. The outcome is quantitatively similar to that obtained with high-selective and costlyfatcat:ilolnavy7zd57ejk4unlhpbq6y