The United States Environmental Protection Agency held an international two-day workshop in June 2018 to deliberate possible performance targets for non-regulatory fine particulate matter (PM 2.5 ) and ozone (O 3 ) air sensors. The need for a workshop arose from the lack of any market-wide manufacturer requirement for Ozone documented sensor performance evaluations, the lack of any independent third party or government-based sensor performance certification program, and uncertainty among all users as to the general usability of air sensor data. A multi-sector subject matter expert panel was assembled to facilitate an open discussion on these issues with multiple stakeholders. This summary provides an overview of the workshop purpose, key findings from the deliberations, and considerations for future actions specific to sensors. Important findings concerning PM 2.5 and O 3 sensors included the lack of consistent performance indicators and statistical metrics as well as highly variable data quality requirements depending on the intended use. While the workshop did not attempt to yield consensus on any topic, a key message was that a number of possible future actions would be beneficial to all stakeholders regarding sensor technologies. These included documentation of best practices, sharing quality assurance results along with sensor data, and the development of a common performance target lexicon, performance targets, and test protocols.

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The aim of the work is to analyze the essence of the blockchain system and its architecture. Application of this ystem for geospatial data management, for solving mapping and land management. The uniqueness of the use of blockchain technologies eliminates the falsification of information in electronic registers by storing information “blocks”. The system does not have a single storage location. The data register is stored simultaneously for all participants in the system and is simultaneously updated with changes, which minimizes the risk of information loss. At the moment, we can trace such a global trend as the use of blockchain technology in various industries, because it affects most industries. We have the opportunity to use blockchain technology from our usual banking operations to real-time finance and real estate. Today, this trend integrates into other industries, which are actively developing and implementing numerous startups. It is safe to say that the blockchain is creating a revolution and today it can be compared with the ingenious invention of the XX century – the Internet. This technology gives us a completely new, different approach to storing information and conducting transactions by establishing trust rules. Due to this, this technology becomes more suitable because it has requirements with a high degree of security.