// Receive data from sensors
var indoorDataStream = _sensorDataService.GetSensorPresure("IndoorSensor");
var outdoorDataStream = _sensorDataService.GetSensorPresure("OutdoorSensor");

// Combine Indoor and outdoor data and generate alerts if pressure dirrence is above 20
var pressureDataAlerts = indoorDataStream
                            .Zip(outdoorDataStream)
                            .Select(combined => Math.Abs(combined.First.Pressure - combined.Second.Pressure))
                            .Where(v => v > 20);


await foreach(var deltaPressure in pressureDataAlerts)
{
    Console.WriteLine($"{DateTime.Now.ToString("hh:mm:ss.fff")} - ALERT Pressure difference {deltaPressure}");
}