Ecological and metrological aspects of greenhouse gases global monitoring systems are considered. The possibilities and features of the calibration of measuring equipment for the global monitoring systems are selected. The analysis results of international comparisons of national standards and calibration capabilities of national metrology institutes for greenhouse gases are reduced.

This paper presents activities performed by Croatian Accreditation Agency (HAA) in the field of accreditation of testing laboratories in the area of environmental protection in compliance with HEN EN ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories It presents results of the accreditation activities on different areas of environmental protection (emission of pollutants from stationary sources, air quality, noise and sound isolation, waters) and other HAA activities related to this area.

The global positioning system (GPS) is a Global Navigation Satellite System (GNSS) uses a constellation of between 24 and 32 Medium Earth Orbit satellites that transmit precise microwave signals, which enable GPS receivers to determine their current location, the time, and their velocity. Initially, the GPS was developed for military applications, but very quickly became the most used technology in positioning even for end-user applications run by individuals with no technical skills. GPS reading are used also as reference points for many positioning techniques such as the techniques that depend on the transmitted electromagnetic signal to determine the position of the transmitter or the receiver, due to their superior accuracy comparing to such techniques. But how accurate are those readings, and how to obtain accurate reference points starting from raw GPS observations even when they are corrupted with errors. In this paper, a practical study about GPS positioning is provided. Generating the ground-truth reference points depending on GPS observations is also provided and discussed in details.

Results of CIPM, EURAMET and COOMET key and supplementary comparisons of national measurement standards and calibration and measurement capabilities (CMCs) of the Ukrainian national metrological institute “Ukrmetrteststandard” in 2000–2010 are considered.

Medical measurements are present in the everyday life of people and are fundamental processes in prevention, diagnosis and treatment of disease. Therefore, a growing interest lies in the role of metrological decisions and conformity assessment, namely where measurements are in support of health. This paper focuses on the use of medical devices looking to enhance its metrological traceability, highlighting the specific role of metrology in the field of health care and the impact of legal control in the framework of the medical devices regulation with a measuring function. It is proposed a new regulatory approach for medical devices in use, facing the convergence between European policy enforcement and Metrological regulations.