A sensing network comprising: - a plurality of sensor nodes (S), wherein each of the plurality of sensor nodes (S) includes a gas sensor configured to measure the presence, concentration, or both, of one or more airborne pollutants in a first coverage area surrounding the sensor node, - a sensor base (B) configured to measure the presence, concentration, or both, of one or more airborne pollutants in the first coverage area of each of the plurality of sensor nodes (S), wherein the sensor base (B) includes a gas sensor with higher accuracy and higher sensitivity than the gas sensors of the plurality of sensor nodes (S), and - a data center comprising one or more servers communicatively coupled to the sensor base (B) and the plurality of sensors nodes (S), wherein the sensor base (B) and the sensor nodes (S) are adapted to communicate their measurements to the data center , which is adapted to use the measurements of the sensor base (B) as a reference to correct the measurements of the plurality of sensor nodes (S), characterized in that the data center is adapted to determine whether a sensor node is starting to drift rapidly but still functions acceptably, and in that case, to adjust the corresponding sensor base (B), which covers the specific sensor node, to increase air sample monitoring frequency around said sensor node. - a plurality of sensor nodes (S), wherein each of the plurality of sensor nodes (S) includes a gas sensor configured to measure the presence, concentration, or both, of one or more airborne pollutants in a first coverage area surrounding the sensor node, - a sensor base (B) configured to measure the presence, concentration, or both, of one or more airborne pollutants in the first coverage area of each of the plurality of sensor nodes (S), wherein the sensor base (B) includes a gas sensor with higher accuracy and higher sensitivity than the gas sensors of the plurality of sensor nodes (S), and - a data center comprising one or more servers communicatively coupled to the sensor base (B) and the plurality of sensors nodes (S), wherein the sensor base (B) and the sensor nodes (S) are adapted to communicate their measurements to the data center , which is adapted to use the measurements of the sensor base (B) as a reference to correct the measurements of the plurality of sensor nodes (S), characterized in that the data center is adapted to determine whether a sensor node is starting to drift rapidly but still functions acceptably, and in that case, to adjust the corresponding sensor base (B), which covers the specific sensor node, to increase air sample monitoring frequency around said sensor node. the sensor base (B) and the sensor nodes (S) are adapted to communicate their measurements to the data center , which is adapted to use the measurements of the sensor base (B) as a reference to correct the measurements of the plurality of sensor nodes (S), characterized in that the data center is adapted to determine whether a sensor node is starting to drift rapidly but still functions acceptably, and in that case, to adjust the corresponding sensor base (B), which covers the specific sensor node, to increase air sample monitoring frequency around said sensor node. <EOS>