Air pollution has become one of the largest issues that cause harmful human and environ- mental health due to harmful chemicals and other toxic materials which result from external interactions such as factory and vehicle smoke, or from internal interactions such as cooking smoke or detergents. Indoor air quality monitoring is important for the health and comfort of people who spend most of their time indoors. Most people are unaware that indoor air quality could be poor, until studies have shown that indoor pollutant levels can be two to five times greater than outdoor levels. There are some existing systems that monitor indoor air quality that only detect one parameter for monitoring of air pollution, some of them have a high cost, it doesn’t provide a monitoring process in real-time, and not easy to use because it is intended for professionals. In recent years, mobile technology, specially the internet of things has had a positive impact on how we manage our health. The Internet of things (IoT) is a technique that connects devices with the internet. In this project, an Indoor Air Quality Monitoring System (IAQM) is proposed based on IoT technology. The concept of the proposed system is to deploy sensors that measure air quality parameters which are connected to ESP32 microcontroller in a restaurant environment. According to our knowledge, this system is the first system in the kingdom of Saudi Arabia that may help competent authorities to monitor the indoor air quality in restaurant environments remotely. The cloud was used to process and store the collected data, and display it as a numerical and graphical representation on mobile applications. The proposed system is built in four phases. In the first phase, the requirements of the IAQM system were analyzed by visiting the restaurants and knowing the needs of competent authorities. In the second phase, the monitoring device and user interface are designed. In the third phase, the system was implemented in a restaurant’s environment in real-time and tested under certain conditions. In the final phase, the system was verified based on the required requirements and tested through a number of standards that were relied on in testing cases inside the restau- rant’s kitchen. Through this system, competent authorities can easily monitor the air quality in restaurants by using the application.