The article discusses using IoT technology to monitor air pollution in smart cities. Pollution from vehicles, burning stubble, and power plants causes health issues, with 2 million deaths annually. Delhi has poor air quality, leading to respiratory diseases. An air quality index rates air quality from good to poor. A Bosch sensor can monitor air quality, and a Telit Bravo kit can create an IoT device to turn on air purifiers when needed. The device predicts temperature and particulate matter 2.5 levels, using historical data to correlate with air quality.