An arrangement includes a plurality of wireless microsystems and a central data processor. Each microsystem is operable to measure a plurality of indoor environmental quality-related parameters and is operable to communicate first information pertaining to the measured parameters wirelessly to a network device. The central data processor is operably coupled to receive the first information from the network device, and further configured to generate a metric value of an indoor environmental quality of at least a first space based at least in part on the first information, the metric value dependent upon each of the measured parameters of at least a first of the plurality of microsystems.