  As a part of this project, we have developed an IoT-based instrument
utilizing the NODE MCU-ESP8266 module, MQ135 gas sensor, and DHT-11 sensor for
measuring CO$_2$ levels in parts per million (ppm), temperature, and humidity.
The escalating CO$_2$ levels worldwide necessitate constant monitoring and
analysis to comprehend the implications for human health, safety, energy
efficiency, and environmental well-being. Thus, an efficient and cost-effective
solution is imperative to measure and transmit data for statistical analysis
and storage. The instrument offers real-time monitoring, enabling a
comprehensive understanding of indoor environmental conditions. By providing
valuable insights, it facilitates the implementation of measures to ensure
health and safety, optimize energy efficiency, and promote effective
environmental monitoring. This scientific endeavor aims to contribute to the
growing body of knowledge surrounding CO$_2$ levels, temperature, and humidity,
fostering sustainable practices and informed decision-making
