Nowadays, Air pollution is a major health issue for a humans, birds, animals and trees etc. because of plastic waste, vehicles, industry which is harmful for us. These factors have harmful effects on human health for people who are directly exposed to the polluted air. That’s why level of air pollution is increased day by day. So, clean air is important for everyone’s health and safety. However, air quality is getting worse in many cities across India like Delhi, Patna etc. The main cause of pollution is fine particulate matter, which leads to health diseases like asthma, lung diseases and other respiratory problems. There is a need for a low-cost air pollution monitoring system so it can be easily used anywhere. This paper represents a low-cost air pollution monitoring system that uses different sensors to measure the air quality. The MQ2 sensor detects gases like Hydrogen, LPG and Smoke. The MQ135 sensor measure the air quality and the DHT11 sensor is used to measure the temperature and humidity. All these different sensors are connected to an ESP32 microcontroller, which sends the collected data to the cloud. Then the results are shown on LCD display so users can see easily and understand the air quality around them.

The conclusion of this paper is an improved way to monitor air quality. In this system, different sensors and IoT technology are used. This system is small, easy to use and more efficient. It helps user to understand pollution levels and then take quick action to keep the environment clean and safe for peoples. In future, more sensors can be added in this system to check air quality in more detail. The system should also be made flexible and scalable so it can be used on a larger scale area for better results.

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