Re: "1.5x10^27 oxygen particles [..] annually"
Oxygen is most stable as the molecule O2 but also exists as O3 a bit less stable. Oxygen as a standalone atom is fairly unstable and will combine with something else quickly.
Oxygen is most stable as the molecule O2 but also exists as O3 a bit less stable. Oxygen as a standalone atom is fairly unstable and will combine with something else quickly.