Objective To investigate the distribution trend of particle size of inhalable particles in indoor air at different floors of a building.
Methods Indoor air samples were collected from hotels and residential buildings having been completed and used for 3-6 years. Samples were grouped by the floor of a building; less than 10, 10~14, 15~19, 20~29 and more than 30 floors; the distribution of particle size, < 1, 1, 2, 5 and 10 μm, were measured under microscope, and the constituent ratio was analyzed by the statistical probability distribution of skewness.
Results As the increase of the floor of a building, the distribution of particles was changed from a left-skewed distribution to a right-skewed distribution; the particle size became smaller with the increase of the floor height under a logarithm trend (r=0.955 7). The correlation tested by t test was significant (P < 0.05).
Conclusions The size of particulate matters in indoor air became smaller as the floor of a building was higher. The research on the distribution of inhalable particles in indoor air at different floor height has certain reference significance to help people correctly recognize and control the health hazards of inhalable particulate matters.
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