A computer implemented process of determining an airborne viral infection risk score of one or more monitored air spaces in one or more buildings, comprising: communicating , by a processing circuit and over a network, with a plurality of air quality sensors arranged in the monitored air spaces and retrieving over the network current indoor air parameter measurements of the monitored air space in the one or more buildings, the air parameter measurements including the following air parameter measurement types: air relative humidity; air temperature; and one, two, or all, of: air CO2 concentration; air fine particulate matter PM2.5 concentration; air particulate matter PM10 concentration; storing the air parameter measurements to a database for access by a web portal; calculating relative humidity instantaneous airborne viral infection risk score from the relative humidity sensor air parameter measurement type of the monitored air space, characterized by : calculating an instantaneous airborne viral infection risk score for each of the further measured air parameter measurement types of the monitored air space; storing the instantaneous airborne viral infection risk scores to the database for access by the web portal; determining which one of the air parameter measurement types of the air parameter measurements has a highest instantaneous airborne viral infection risk score; calculating a decay rate for viral infectivity as a function of the air temperature and relative humidity of the monitored air space; applying the decay rate for viral infectivity as a scale factor to the highest instantaneous viral airborne infection risk score to obtain an overall decay rate adjusted highest instantaneous viral airborne virus infection risk score; storing the overall decay rate adjusted highest instantaneous airborne viral infection risk score to the database for access by the web portal; repeating the plurality process steps for a next or same monitored air space. communicating , by a processing circuit and over a network, with a plurality of air quality sensors arranged in the monitored air spaces and retrieving over the network current indoor air parameter measurements of the monitored air space in the one or more buildings, the air parameter measurements including the following air parameter measurement types: air relative humidity; air temperature; and air relative humidity; air temperature; and one, two, or all, of: air CO2 concentration; air fine particulate matter PM2.5 concentration; air particulate matter PM10 concentration; air CO2 concentration; air fine particulate matter PM2.5 concentration; air particulate matter PM10 concentration; storing the air parameter measurements to a database for access by a web portal; calculating relative humidity instantaneous airborne viral infection risk score from the relative humidity sensor air parameter measurement type of the monitored air space, characterized by : calculating an instantaneous airborne viral infection risk score for each of the further measured air parameter measurement types of the monitored air space; storing the instantaneous airborne viral infection risk scores to the database for access by the web portal; determining which one of the air parameter measurement types of the air parameter measurements has a highest instantaneous airborne viral infection risk score; calculating a decay rate for viral infectivity as a function of the air temperature and relative humidity of the monitored air space; applying the decay rate for viral infectivity as a scale factor to the highest instantaneous viral airborne infection risk score to obtain an overall decay rate adjusted highest instantaneous viral airborne virus infection risk score; storing the overall decay rate adjusted highest instantaneous airborne viral infection risk score to the database for access by the web portal; repeating the plurality process steps for a next or same monitored air space. <EOS>