Content Distribution of NO₂ in Air of Different Functional Areas of Campus and Its Health Risk Assessment

To understand the content distribution of NO₂ in our campus, and whether it would influence the health of teachers and students, the functional regionalization method was applied to set representative sampling points in campus. The short-time sampling method was applied to gather samples, in which 10 groups of data at each sampling point were collected. The data was analyzed by the theory of N-(1-napthyl) ethylenediamine hydrochloride diazo-coupling spectrophotometric. The results show that the concentration of NO₂ in the air was less than 80.0 μg^·m^-3. The risk-based approach was applied for health risk assessment, and the result suggested that the Health Risk (HR) of NO₂ was less than 1, which did not affect the health of teachers and students.