A pollution sensor is a device designed to detect and measure the levels of various pollutants in the air, water, or soil. These sensors can identify harmful substances such as carbon monoxide, nitrogen dioxide, and particulate matter, providing valuable data for environmental monitoring. They are often used in urban areas to assess air quality and help inform public health decisions. Pollution sensors can be found in various forms, including handheld devices and fixed installations. Many modern sensors are equipped with wireless technology, allowing real-time data transmission to smartphones or computers. This information helps communities and governments take action to reduce pollution and protect the environment.