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Presents the results of formaldehyde (HCHO) concentration measurements undertaken in ten kindergartens and ten primary schools (one room in each) during the summer and the winter periods. The buildings were of differing age (1‐100 years) and structure (from conventional to prefabricated type), and particle‐board furniture was used in all premises. Results show that the proposed limit value of 120 μg/m³, recommended by WHO for living accommodation, was frequently exceeded. The seasonal differences of concentrations were statistically significant for nine kindergartens and seven schools.

Details how distributions of exposure to ammonia in living rooms were calculated by use of Duan’s Cartesianization method for four population groups of Zagreb inhabitants (high‐school students, university students, employed and retired persons), for summer and winter periods. Households were grouped in two categories, city centre and suburbs. The main difference between these two categories was the so‐called green areas (parks, gardens, etc.) in the neighbourhood. The exposure levels are lower in the city centre compared to the suburbs. The results show seasonally dependent contribution to exposure in households from outdoor sources by ventilation in suburbs. Exposure distribution functions could be represented by normal, or summation by proportion of normal, Weibull and Erlang distributions. Concludes that by the comparison of the results and proposed exposure guideline value, it could be argued that no ammonia exposure problem exists in Zagreb.