A method for testing a batch of environmental sensors to determine the fitness for purpose of the batch of environmental sensors, wherein the environmental sensors comprise gas sensors; and wherein each gas sensor comprises: a dielectric membrane formed on a semiconductor substrate comprising an etched portion; a heater formed in the dielectric membrane; gas sensing electrodes formed on the dielectric membrane; and a gas sensitive layer formed on the gas sensing electrodes; and wherein the method comprises: determining environmental parametric ranges by performing a plurality of environmental tests on at least one gas sensor under an environmental condition; performing a plurality of electrical test sequences to the heater of the at least one gas sensor to measure electrical responses of the sensor outputs of the at least one gas sensor; correlating the measured electrical responses from the at least one gas sensor to the predetermined environmental parametric ranges of the at least one gas sensor so as to define correlated electrical test limits; testing the gas sensors by exclusively applying electrical impulses to each sensor of the batch of gas sensors and by exclusively measuring electrical responses of each sensor of the batch of gas sensors, and wherein the electrical impulses are applied to the heater of each gas sensor of the batch of gas sensors and the electrical response is measured across the gas sensing electrodes of each gas sensor of the batch of gas sensors; and determining the fitness for purpose of the batch of gas sensors if measured electrical responses of the batch of gas sensors are within the correlated electrical test limits. a dielectric membrane formed on a semiconductor substrate comprising an etched portion; a heater formed in the dielectric membrane; gas sensing electrodes formed on the dielectric membrane; and a gas sensitive layer formed on the gas sensing electrodes; and wherein the method comprises: determining environmental parametric ranges by performing a plurality of environmental tests on at least one gas sensor under an environmental condition; performing a plurality of electrical test sequences to the heater of the at least one gas sensor to measure electrical responses of the sensor outputs of the at least one gas sensor; correlating the measured electrical responses from the at least one gas sensor to the predetermined environmental parametric ranges of the at least one gas sensor so as to define correlated electrical test limits; testing the gas sensors by exclusively applying electrical impulses to each sensor of the batch of gas sensors and by exclusively measuring electrical responses of each sensor of the batch of gas sensors, and wherein the electrical impulses are applied to the heater of each gas sensor of the batch of gas sensors and the electrical response is measured across the gas sensing electrodes of each gas sensor of the batch of gas sensors; and determining the fitness for purpose of the batch of gas sensors if measured electrical responses of the batch of gas sensors are within the correlated electrical test limits. determining environmental parametric ranges by performing a plurality of environmental tests on at least one gas sensor under an environmental condition; performing a plurality of electrical test sequences to the heater of the at least one gas sensor to measure electrical responses of the sensor outputs of the at least one gas sensor; correlating the measured electrical responses from the at least one gas sensor to the predetermined environmental parametric ranges of the at least one gas sensor so as to define correlated electrical test limits; testing the gas sensors by exclusively applying electrical impulses to each sensor of the batch of gas sensors and by exclusively measuring electrical responses of each sensor of the batch of gas sensors, and wherein the electrical impulses are applied to the heater of each gas sensor of the batch of gas sensors and the electrical response is measured across the gas sensing electrodes of each gas sensor of the batch of gas sensors; and determining the fitness for purpose of the batch of gas sensors if measured electrical responses of the batch of gas sensors are within the correlated electrical test limits.