If your goal is to avoid all suspicion of harmful chemicals, than using traditional deodorant or antiperspirant will make that very difficult. The easiest way to keep your body safe and healthy is to avoid entirely all chemical laden deodorants and antiperspirants, and begin using natural deodorants.
Medical Definition of nitro. : containing or being the monovalent group NO2 united through nitrogen.
6.4.3. Nitrous Oxide. Nitrous oxide (N. O) is an important, long-lived greenhouse gas that is emitted predominantly by biological sources in soils and water, and removed in the upper atmosphere via photochemical reactions. Unfortunately, estimates of sources and sinks are not well quantified in global terms. 6.4.3.1.