Test and analysis of classroom air quality in northern area

Tests the indoor temperature, relative humidity and the concentration of carbon dioxide, carbon monoxide, volatile organic compounds, formaldehyde, respirable particles and radon in typical classrooms of a university in Harbin during heating period, and investigates classroom air quality by questionnaires. The analysis results indicate that the subjective investigation and test results are in good accordance, that the effect of carbon dioxide concentration on classroom air quality is the largest, and that indoor air quality can be improved by reducing occupant density and enhancing indoor ventilation reasonably.