###### Abstract
Moreover, the authors compared TS with water electrospray (ES) in a one-stage system and TS operated in dry or humid air followed by water ES in a two-stage system, and show that gaseous HNO\({}_{2}\), rather than NO or NO\({}_{2}\), plays a major role in the formation of NO\({}_{2}\)\({}^{-}\)(aq) in plasma-activated water (PAW) that reached the concentration up to 2.7 mM. Moreover, [PERSON] and [PERSON] [5] were using helium atmospheric pressure plasma jet source in the treatment of white grapes juice for winemaking purposes. Based on principles of dielectric barrier discharge, an atmospheric pressure plasma jet in helium was used to treat two types of grape white fresh musts, after that, the resulting 1 and 2 year old wine was characterized and the correlation of plasma parameters (mean power, current density, RONS) and the physico-chemical proprieties (pH values, BRIX, UV-Vis and FTIR spectroscopy, CIE L*a*b* and RGB ) of white must and wine were assessed. [PERSON] et al. [6] investigated the non-thermal plasma jet excitation modes and the optical assessment of its electron concentration. They proposed and described a new method based on digital holography to estimate electronic concentration for a non-thermal plasma source, taking into account its disadvantages and further applications. [PERSON] and [PERSON] [7] examined the use of a cold atmospheric pressure plasma jet source operated both in Ar and He, optically and electrically, going from basic plasma properties to vacuum ultraviolet, electric field determinations as well as safety thresholds measurements in Plasma Medicine. They reported that the surface temperature and leakage values of both systems showed different slopes, with the biggest surprise being a constant leakage current over distance for argon jet. [PERSON] et al. [8] followed up on the characteristics of 2.45 GHz surface-wave-sustained argon discharge for bio-medical applications. Their manuscript presents the characterization and optimization of the active region of surface-wave-sustained argon plasma for biological systems treatment. Their result shows that a discharge tube with a bigger inner diameter is able to obtain a surface temperature of 45 \({}^{\circ}\)C, as is required for the treatments in biology, medicine and agriculture. A review by [PERSON] et al. [9] focuses on the applications of cold atmospheric pressure plasma in Dentistry. Their manuscript outlines the application of cold atmospheric pressure plasma (CAPP) in dentistry for the control of several pathogenic microorganisms, as well as for induction of anti-inflammatory, tissue repair effects and apoptosis of cancer cells, with low toxicity to healthy cells. Therefore, CAPP has the potential to be applied in many areas of dentistry such as cardiology, periodonontology, endodontics and even oral oncology. A review by [PERSON] et al. [10] is directed towards optical emission spectroscopy (OES), as a diagnostic tool for the characterization of atmospheric plasma jets. They revealed the advantages and limitations of the method, in comparison with other information given by other spectroscopic methods, e.g., VUV, that can bring more insights into the energetic species in the plasma. This collection of reports on different plasma-based technological applications, gathered in this Special Issue brought from the community a total of 28 citations and more than 8600 views, showing the growing interest of society in such green technologies (without chemicals and by-products). Finally, the Editor is delighted to have had the honor of organizing this Special Issue for _Applied Sciences_, which highlights the research of distinguished scientists in the field of plasma physics. The Editor would like to thank all the contributors to this Special Issue for their commitment and enthusiasm during the compilation of the respective articles. The Editor also wish to thank the members of the editorial staff at Multidisciplinary Digital Publishing Institute (MDPI) for the professionalism and dedication they have shown in completing this Special Issue.