This dataset consists of files used to produce the data presented in the article "A computational study of steady and stagnating positive streamers in N$_2$-O$_2$ mixtures". This dataset includes 1) source code for the simulations; 2) transport data files, which contain a list of included reactions, their reaction rate coefficients, and transport coefficients; 3) configuration files for running the simulations and 4) outputted log files of the simulations.