Fig. 3: Concentrations of four kinds of representative, long‐lived aqueous reactive species (RS; H2O2, NO3−, NO2− and O3) in plasma‐activated water induced by the air plasma.

Each point represents the mean of nine values ± standard deviation. The significance level ***p < 0.001 for each RS concentration at every plasma inducement time, except for H2O2 at the plasma inducement time of 15 min (**p < 0.01). Reprinted with permission from ref. 57.