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The emissions of indoor nitrogen oxides have increased during the last period. Thorough knowledge of the interactions of individual influencing factors to nitrogen oxides pollutions in the indoor working environment provides guarantees of comfort, hygiene, and health for future manufacture buildings performance and production. A comprehensive assessment of the environmental safety of the working environment through appropriate analyses of transfer processes, impact rates, and interaction relationships must become an essential part of conceptual solutions in the design and implementation of an environmental approach to manufacturing building objects. Integrated indoor and outdoor concentrations were measured using passive samplers. Indoor characteristics, including technology and the presence of a gas range, were significantly associated with indoor nitrogen oxides concentrations. The Model 410 Nitric Oxide Monitor"for measurement of atmospheric nitric oxide (NO) in combination with Model 401 NO2 Converter, NOx and NO2 (by difference), for indoor working environment monitoring, was used. The contamination of the indoor working environment depends on the gas's consumption for manufacture and combustion processing as well as on air change level. The indoor and outdoor NOx concentrations varied during the seasons. The average indoor concentrations were higher than the outdoor ones. A comprehensive analysis of indoor air pollution by nitrogen oxides shows that the extent of indoor air pollution and consequent exposure varies because of many factors mainly the gas consumption, burning intensity, differing air change and distribution of appliances and their level of use.