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This article illustrates the conclusions drawn from the development of Internet-of-Things (IoT) systems intended to monitor the ambient parameters, including the quality of the air in different environments, both indoor and outdoor. The design and development in the context of IoT is severely influenced by requirements for small form factor, easy to use, measurement devices, which are deployed in combination with scalable, web-based or portable, applications. The particular case of Bluetooth Low Energy (BLE) technology, miniaturization, and power and cost efficiency were the major aspects taken into account in the research presented here. The considered systems focus on living spaces, classrooms, university amphitheaters and laboratories, and office buildings, and target the achievement of a lifetime of the measurement devices as long as possible. Our experimental results indicate an operating period between a couple of months and 3 years for wireless sensing devices powered by a single off-the-shelf battery, depending on the measurement and transmission rates. All the developed systems are suitable for the implementation of scenarios in the context of IoT and offer future development possibilities in terms of measurement and energetic capabilities, which are supported by the rapid progress in the integrated circuit (IC) industry and by firmware optimization.