<![CDATA[Air quality is influenced by activities that produce gas from natural and human sources, so monitoring gas levels is important to prevent health threats. The goal is to create a natural gas monitoring tool that is efficient (easy to use) and can be accessed from a smartphone. The tool designed uses MQ-2 and MQ-6 sensors for detecting gas levels and DHT11 sensors for temperature and humidity. Data is sent in real-time on the smartphone via the Blynk application with the nRF24L01+ module. The results showed that the system worked well in monitoring butane, methane, temperature, and humidity. The highest error value on the MQ-2 sensor is 24.375%. Methane gas measurements using the MQ-6 sensor show the highest error value of 11.06%. The nRF24L01+ module successfully sends data to the receiver and activates the Light Emitting Diode (LED) and buzzer when the value exceeds the set limit. This module can send data up to a distance of 1000 meters without Line-of-Sight (LOS) obstructions and has a reduced distance of up to 600 meters in the presence of Non-Line-of-Sight (NLOS) obstructions. The Blynk application successfully displays data measuring gas levels, temperature and humidity.]]>
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