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We developed an in-situ analyzer to understand the HONO levels in indoor environments. The in-situ measure-with time resolution of 4-minute. Concentrations of NO, NO2, and HONO were determined at an indoor air of anapartment for 9 days using the developed in-situ analyzer. Indoor HONO concentrations were highly elevated whena gas range was operated. Enhancements of the indoor NO, NO2, and HONO concentrations during combustionindoor HONO was partially generated from heterogeneous reactions of NO2 on indoor surfaces, which was sup-ported by strong relationships between peak NO, NO2, and HONO concentrations, high HONO/NO2 ratio and aweak correlation between NO and HONO concentrations. Additionally, three combustion experiments during theHONO, NO, and NO2 concentrations and their decay. The decay rate of the HONO concentration was signicantlyless than the NO and NO2 decay rates for all the experiments, indicating that the lifetimes of trace nitrogen speciesin indoor environment varied in the order approximately HONO>NO2>NO.