Atmospheric reactive nitrogen cycling is crucial for maintaining the atmospheric oxidation capacity of background atmosphere on the Tibetan Plateau , with nitrous acid (HONO) and particulate nitrite (NO₂^-) as important intermediates. During an eleven-day field campaign at the Base Camp of Mt. Qomolangma in spring of 2022, we observed significant enrichment of NO₂^- in total suspended particulate (TSP) with a mean concentration of 375 &plusmn; 386 ng m^-3, while NO₂^- was absent in fine particles (PM_2.5). The comparison revealed that NO₂^-predominately exists in coarse particles. Local surface soil at the sampling site also exhibited high levels of NO₂^-, with <em>&delta;</em>¹⁵N value similar to NO₂^-in TSP. This similarity suggests that wind-blown soil is probably the primary source of NO₂^- in TSP, accounting for the background levels. While concentration changes of water-soluble inorganic ions in TSP and PM_2.5 in response to shifts in air mass back-trajectories imply that atmospheric pollutants transported from South Asia may further elevate the NO₂^-, the specific mechanisms of long-range transport resulting in NO₂^-accumulation in TSP rather than PM_2.5 remain unknown and need to be investigated. Our results reveal an overlooked source of atmospheric NO₂^-, i.e., soil NO₂^-, and highlight in remote regions such as Tibet where other sources are limited, wind-blown soil may serve as an important source of atmospheric NO₂^-. Once lofted into the atmosphere, NO₂^- may readily participate in atmospheric reactive nitrogen cycling through gas-particle partitioning or photolysis, leading to the production of HONO, OH and NO and thereby influencing oxidation chemistry.