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An air quality study was conducted at Šime Budinić Primary School in Zadar by monitoring the concentration of carbon dioxide (CO₂) in different school areas (the geography classroom, the school hall, the school kitchen and the school gymnasium). Measurements were taken during summer and winter to analyze differences in carbon dioxide concentration in different seasons and to determine changes in levels during the school day. The results showed that elevated carbon dioxide concentrations were recorded during classes in the classroom, especially in conditions of insufficient airing. Dangerous levels of carbon dioxide were measured in the school kitchen during meal preparation, which indicates a great need for improving the ventilation and airing system. Lower and more stable levels of carbon dioxide were measured in the school gymnasium and school hall because they are larger spaces with better airing. Comparing the data obtained in summer and winter, higher average values of carbon dioxide were observed in all selected areas. Regular airing of school premises, installation of air quality measurement devices and maintenance of green areas around the school are important in maintaining good air quality and creating a healthy school environment. The results of measurements conducted in Vruljica Park showed lower concentrations of carbon dioxide, within acceptable limits for open space. This confirms the importance of green areas for reducing carbon dioxide levels and improving air quality in the city.