A smart CO2 sensor is a device that is used to measure the concentration of carbon dioxide in the air. It is an important tool for monitoring air quality, as carbon dioxide is a key indicator of air pollution. Smart CO2 sensors are designed to be highly accurate and reliable, and they are able to detect even small changes in CO2 levels. They are typically connected to a network of other sensors, allowing for the collection of data from multiple locations. This data can then be used to create a comprehensive picture of air quality in a given area. Smart CO2 sensors are also able to alert users when levels of CO2 reach a certain threshold, allowing for quick action to be taken to reduce emissions and improve air quality.