The system of education in Poland is affected by rapid and deep political, organizational,demographic and financial changes. Although requirements for indoor air quality aredescribed in detail in Polish building codes and standards, the real state of indoor environmentin classrooms is not well documented. However, published studies show that in schools withconventional stack ventilation indoor air quality is rather poor. Unintentionally, very oftenproblems are related to modernized buildings where energy conservation measures have beenapplied. This paper describes newly developed study designed to investigate pupils selfestimationof indoor environment in schools. Results based on inspection of 235 schools showed the basic reasons and magnitude of self-estimated dissatisfaction.