Gas alarm and gas monitoring system

The invention provides a gas alarm and a gas monitoring system. The gas alarm comprises: at least two gas sensors including a first gas sensor and a second gas sensor which are respectively used for detecting different gases; a processor which is connected with the at least two gas sensors and is used for processing the signals acquired by the at least two gas sensors so as to obtain the concentration value of the corresponding gas detected by each gas sensor, and sending data to be alarmed when the concentration value of the gas detected by any gas sensor is greater than a corresponding concentration threshold value; an alarm unit which is connected with the processor and is used for converting the data to be alarmed into alarm data after the processor continuously sends the data to be alarmed for a preset time and sending the alarm data; and a communication unit which is respectively connected with the at least two gas sensors, the processor, the alarm unit and an OneNET cloud platform. According to the sch