A system comprising: a sensing unit including: a gas sensor having a resistance that changes as a function of gas concentration and configured to generate a gas sensor signal in response to a presence of at least one gas, and a heater configured to adjust a temperature of the sensor; at least one processor adapted to: control the heater to adjust the temperature of the gas sensor to a first temperature value for a first period of time, determine a first signal value by measuring the gas sensor signal during the first period of time, control the heater to adjust the temperature of the gas sensor to a second temperature value for a second period of time, determine a second signal value by measuring the gas sensor signal during the second period of time, and calculate concentration information for at least one gas based at least in part on: the first signal value and a first calibration relationship of the sensing unit at the first temperature value, and the second signal value and a second calibration relationship of the sensing unit at the second temperature value; and wherein the first temperature value is different from the second temperature value. a sensing unit including: a gas sensor having a resistance that changes as a function of gas concentration and configured to generate a gas sensor signal in response to a presence of at least one gas, and a heater configured to adjust a temperature of the sensor; a gas sensor having a resistance that changes as a function of gas concentration and configured to generate a gas sensor signal in response to a presence of at least one gas, and a heater configured to adjust a temperature of the sensor; at least one processor adapted to: control the heater to adjust the temperature of the gas sensor to a first temperature value for a first period of time, determine a first signal value by measuring the gas sensor signal during the first period of time, control the heater to adjust the temperature of the gas sensor to a second temperature value for a second period of time, determine a second signal value by measuring the gas sensor signal during the second period of time, and calculate concentration information for at least one gas based at least in part on: the first signal value and a first calibration relationship of the sensing unit at the first temperature value, and the second signal value and a second calibration relationship of the sensing unit at the second temperature value; and control the heater to adjust the temperature of the gas sensor to a first temperature value for a first period of time, determine a first signal value by measuring the gas sensor signal during the first period of time, control the heater to adjust the temperature of the gas sensor to a second temperature value for a second period of time, determine a second signal value by measuring the gas sensor signal during the second period of time, and calculate concentration information for at least one gas based at least in part on: the first signal value and a first calibration relationship of the sensing unit at the first temperature value, and the second signal value and a second calibration relationship of the sensing unit at the second temperature value; and the first signal value and a first calibration relationship of the sensing unit at the first temperature value, and the second signal value and a second calibration relationship of the sensing unit at the second temperature value; and wherein the first temperature value is different from the second temperature value.