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Ozone (O3) generation and its temporal development to steady state are investigated in a precise model using all high-rate reactions for various conditions of gas pressure (P), electron density (ne), and temperature (T) of an evolving electron-induced O2 corona plasma. Densities of O and (O3) radicals are determined from their gross formation and destruction. Net ( O3) density so attained in steady state at T = 300 K is over 1025 m-3 for P ~ bar and ne ~ 1015 m-3. However, net O density for the same is lower ~1020 m-3 even though O density exceeded (O3) density in early times of formation. It is shown that (O3) density reduced with temperature heated by discharge in corona, while O density reduced with T up to 500 K and thereafter increased to ~1021 m-3 with still higher T. Both O and (O3) densities varied proportional to the electron density enhanced by avalanche in corona. (O3) varied proportional to pressure, and O exhibited swing to inverse proportionality with larger P.