## 1 Introduction
In safety monitoring and industrial environments, the current approach is to deploy static wireless sensor nodes for the monitoring of ambient and physiological parameters. Several works report on hybrid systems in the monitoring of environmental-physiological domains based on wireless sensor networks (WSN) [25]. [PERSON] et al. present a smart clothing for ECG, blood oxygen saturation, and temperature assessment. Bluetooth Low Energy (BLE) is adopted to transmit the data to a smartphone as gateway to the cloud [28]. [PERSON] et al. introduced a hybrid distributed system for health and safety monitoring [2]. Two sensor nodes, one for environmental measurement (safety node) and the other for vital signs (health node) are deployed utilizing WBAN. Data from the safety node (temperature, humidity, UV, and CO\({}_{2}\)) are transmitted to the health node (HR and body temperature) by BLE. For the long-range data transmission to the cloud, low-power wireless area network (LPWAN) is used. A hybrid and decentralized system including one wrist-worn and one chest-worn device for environmental and physiological monitoring is reported by [PERSON] et al. [29]. The chest-worn measures ECG, pulse oxygen, skin impedance, and strain; the wrist-worn volatile organic compounds (VOCs) and ozone (O\({}_{3}\)), temperature, and humidity. The data are transmitted via smartphone to the cloud. [PERSON] et al. present a distributed wearables system for monitoring of environmental, physiological, and behavioural. The authors implement a three tier IoT solution within the scope of WBAN. They describe convenient and comprehensive system including several wearables on wrist and chest. Data are transmitted via a flexible IoT-gateway (i.e., smartphone) to the cloud [30]. The work reported in Reference [25] presents the implementation of a wearable wireless sensor network measuring the harmful gases (e.g., CO\({}_{2}\)) in industrial environments. The solution is a customized WSN using a low-power low-rate wireless personal area network (LR-WPAN) communications protocol. [PERSON] et al. propose heart rate and breathing rate monitoring of construction workers by the integration of a noninvasive vital sign monitoring into the workers' hearing protection devices (HPDs). The solution is based on using a microphone positioned within the ear canal under the HPD followed with developing digital signal processing algorithms [31]. With respect to chronic-disease management, COPD is of particular relevance. COPD patients usually are experiencing an altered skin temperature, making their skin more sensitive to UV light [32]. Many patients are suffering from sleep disorders. Thus, physicians seek a better understanding of the ambient living conditions [33]. As of today, remote or tele-monitoring of COPD patients usually is limited to special programs, a short period of time, or a special parameter such as the trans-cutaneous oxygen saturation (SpO\({}_{2}\)) [34]. Contrarily, COPD is impacted by a variety of parameters, for instance, cardiovascular co-morbidity, environmental factors such as exposure to pollutants, and physiological factors [35]. Furthermore, the activity profile is found to be more important for elderly who are suffering from muscle weakness as respiratory parameters [36]. Therefore, multi-dimensional monitoring is necessary and shall not be restricted to particular target populations or parameters, but a wide range of environmental, physiological, and behavioral factors have to be considered [37]. Furthermore, long-term monitoring of the vital signs such as oxygen saturation, heart rate, and near-body temperature indicates the health status [38]. In our aging population, continuous tele-monitoring of patients' suffering from chronic diseases is important. WHO statistics show chronic