Which form of nitrogen compound contributes to acid precipitation?
Nitric oxide contributes indirectly to acid precipitation after atmospheric oxidation. It rapidly reacts to form nitrogen dioxide, which is further converted through radical chemistry to nitric acid; nitrate then returns in rain, snow, particles, or dry deposition. Nitric oxide itself is therefore a precursor rather than the acid deposited. Ammonia can modify acidity by neutralisation and ammonium formation, but the listed combustion-related nitrogen oxide best fits. The distinction is ecologically important because emission control must target either the directly released precursor or the pro
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology
