Table 2.

Measurement results of indoor air in nine kindergartens

During the first survey, excessive particulate material 10 (PM₁₀) level and CO₂ were detected in 9 and 3 of the 9 kindergartens, respectively. During the second survey, the PM₁₀ level was significantly decreased in all kindergartens, and 7 of the 9 kindergartens was decreased below the baseline value. The average changes in CO₂ levels were variable slightly increased. The CO₂ level increased in the study room with poor ventilation.