A gas detector comprising: a first gas sensor having a fluid inlet for receiving a gas sample and a fluid outlet for exhausting the gas sample, the first sensor having a first gas specificity and a first response time; a second gas sensor having a fluid inlet for receiving the gas sample and a fluid outlet for exhausting the gas sample, the second sensor having a second gas specificity and a second response time, wherein the first gas specificity is different than the second gas specificity, the first response time is different than the second response time, or both the first gas specificity and the first response time are different than the second gas specificity and the second response time; a third gas sensor having a fluid inlet for receiving the gas sample and a fluid outlet for exhausting the gas sample, a readout and analysis circuit coupled to the first, second, and third gas sensors and configured to receive data signals from the first, second, and third gas sensors and to read, analyze, and process the data signals from the first, second, and third gas sensors; a control circuit coupled to the readout and analysis circuit and to the first, second, and third gas sensors, wherein the control circuit is configured to execute logic that operates the first, second, and third gas sensors; and the third sensor having a third gas specificity and a third response time and being coupled to the control circuit; wherein: the first gas sensor is a fast-response low-specificity sensor; the second gas sensor is a fast-response partial-specificity sensor; the third gas sensor is a slow-response high-specificity sensor; the control circuit is configured to operate the first, second, and third gas sensors independently; the gas detector is coupled to a gas sampling manifold with multiple inlets for sampling from multiple locations; and the first gas sensor, the second gas sensor, and the third gas sensor are coupled to the gas sampling manifold. a first gas sensor having a fluid inlet for receiving a gas sample and a fluid outlet for exhausting the gas sample, the first sensor having a first gas specificity and a first response time; a second gas sensor having a fluid inlet for receiving the gas sample and a fluid outlet for exhausting the gas sample, the second sensor having a second gas specificity and a second response time, wherein the first gas specificity is different than the second gas specificity, the first response time is different than the second response time, or both the first gas specificity and the first response time are different than the second gas specificity and the second response time; a third gas sensor having a fluid inlet for receiving the gas sample and a fluid outlet for exhausting the gas sample, a readout and analysis circuit coupled to the first, second, and third gas sensors and configured to receive data signals from the first, second, and third gas sensors and to read, analyze, and process the data signals from the first, second, and third gas sensors; a control circuit coupled to the readout and analysis circuit and to the first, second, and third gas sensors, wherein the control circuit is configured to execute logic that operates the first, second, and third gas sensors; and the third sensor having a third gas specificity and a third response time and being coupled to the control circuit; wherein: the first gas sensor is a fast-response low-specificity sensor; the second gas sensor is a fast-response partial-specificity sensor; the third gas sensor is a slow-response high-specificity sensor; the control circuit is configured to operate the first, second, and third gas sensors independently; the gas detector is coupled to a gas sampling manifold with multiple inlets for sampling from multiple locations; and the first gas sensor, the second gas sensor, and the third gas sensor are coupled to the gas sampling manifold. the first gas sensor is a fast-response low-specificity sensor; the second gas sensor is a fast-response partial-specificity sensor; the third gas sensor is a slow-response high-specificity sensor; the control circuit is configured to operate the first, second, and third gas sensors independently; the gas detector is coupled to a gas sampling manifold with multiple inlets for sampling from multiple locations; and the first gas sensor, the second gas sensor, and the third gas sensor are coupled to the gas sampling manifold.