###### Abstract  
This paper presents an original wireless DYU Air Box of an environment-monitoring IoT (EMIoT) system on a campus to offer information on environmental conditions through the public ThingSpeak IoT platform for stakeholders including all the students and employees on the Da-Yeh University (DYU) campus in Taiwan. Firstly, the proposed wireless heterogeneous multi-sensor module aggregates BME680, SCD30, PMS7003, and BH1750 sensors with a TIGO ESP32 Wi-Fi device based on the P\({}^{\text{2}}\)C and UART interface standards of series communication. Through the DYU-802.1X Wi-Fi network with the WPA2 Enterprise security directly, the wireless multi-sensor monitoring module further forwards the observation data of environmental conditions on campus via the DYU-802.1X Wi-Fi network to the public ThingSpeak IoT platform, which is a cloud service platform to aggregate, visualize, and analyze live sensing data of air quality index (AQI), concentrations of PM\({}_{1.0/2.5}\) and CO\({}_{2}\), brightness, ambient temperature, and relative humidity (RH). The results illustrate the proposed DYU Air Box for monitoring the indoor environmental conditions on campus and validate them with sufficient accuracy and confidence with commercialized measurement instruments. In this work, the wireless smart environment-monitoring IoT system features monitoring and automatic alarm functions for monitoring AQI, CO\({}_{2}\), and PM concentrations, as well as ambient illumination, temperature, and RH parameters and collaboration and interoperability through the Enterprise Intranet. All the organizational stakeholders interested in the environmental conditions of the DYU campus can openly access the information according to their interests. In the upcoming future, the information of the environmental conditions in the DYU campus will be developed to be simultaneously accessed by all the stakeholders through both the public ThingSpeak IoT platform and the private EMIoT system. wireless DYU Air Box; ThingSpeak IoT; environment-monitoring IoT (EMIoT); 802.1X Wi-Fi network 25 January 20  
university campuses is built at a relatively high population density. Therefore, environmental pollution is an important issue with short- and long-term effects on the surrounding communities and society. This means monitoring and assessment of environmental impacts are crucial to the sustainable well-being and health of university communities. Moreover, the important perspectives of the sustainable development of policies and implementation of activities for university organizations to minimize negative environmental effects are taken into consideration to cost-effectively implement organizational social, educational, and environmental responsibility [3]. The World Health Organization (WHO) pointed out that the level of air pollution significantly increased worldwide in recent decades, and this has caused approximately seven million people to die annually worldwide due to deteriorating air quality [4]. Previous studies have found that exposure to deteriorating air quality has significant negative impacts on human decision-making performance because a high indoor CO\({}_{2}\) concentration [5], especially particulate matter (PM), can lead to a range of health issues including cardiovascular and respiratory disease and cancers, allergies, and other related ailments [6]. In general, all students, teachers, researchers, and administrative staff in university communities face potential harmful threats and health risks from air quality in the campus environment. Therefore, some researchers have paid significant attention to the environmental monitoring of outdoor and indoor air quality on university campuses recently. [PERSON] et al. [7] adopted both fixed and mobile monitoring sites to analyze spatial and temporal concentration variations of traffic-related PM\({}_{1.0}\), PM\({}_{2.5}\), and PM\({}_{10}\) particulate pollutants caused by vehicle emissions on university campuses.