In contrast to the existing Wi-Fi-based systems, we have developed a GSM-based, cellu-lar-Internet of Things (C-IoT) enabled, portable air quality monitoring system that collects the critical air quality parameters through advanced sensors as well as location of the de-vice using Global Positioning System (GPS). Our system utilizes sensors to monitor tem-perature, humidity, carbon dioxide, and Particulate Matter concentrations along with the location information. These sensors are integrated with ESP32 microcontroller which is interfaced with the GPS module for location information as well as with the GSM module to transmit the sensor data and location information to a central IoT gateway using exist-ing cellular infrastructure. The developed C-IoT sensor node is powered through a porta-ble power bank allowing complete mobility of the developed sensor node within the cellu-lar coverage in the entire city. The data collected through the mobile C-IoT system is dis-played in a live dashboard as well as over a live map for location-aware air quality moni-toring. As a pilot run, we collected localized environmental data through developed node by moving around a pre-defined urban area to create a pollution map of the area.