Abstract: A gas detection system includes: a gas detector that detects a first analyte in a first sample gas to generate a first detection signal; a signal generator that generates a first reference signal corresponding to the first analyte; a signal processor that performs first signal processing using the first detection signal and the first reference signal, to thereby generate a first processed signal; and a gas controller that varies the concentration of the first analyte in the first sample gas with time based on the first reference signal so as to make the first detection signal synchronize with the first reference signal.