"Reactive nitrogen" refers to a form of nitrogen that is actively involved in chemical processes and can easily react with other substances. Full definition
One of the key processes involved in secondary damage is iNOS (Nitric oxide synthase)- mediated cell damage, through the generation of reactive nitrogen species peroxinitrates. (psychogenics.com)
The Integrated Nitrogen Committee of the EPA's science advisory board, which held a June public teleconference on the issue of reactive nitrogen in the environment, has generated a draft report that lays out the details, including management options for nitric acid rain. (scientificamerican.com)
Export of reactive nitrogen from coal ‐ fired power plants in the U.S.: Estimates from a plume ‐ in ‐ grid modeling study (aer.com)