This study was carried out to assess the improvement of treatment by the house-plant. For the purpose of this study, 17 asthma-patients residing in Seoul were selected as participants during January to March 2007. We measured VOCs and conducted clinical survey during April to September 2007. In this study, 6 species of houseplants known to be eco-friendly were investigated for the health effect along with 12 other plants. The research focused on peak expiratory flow rate(PEFR) and disease specific quality of life. When the results were compared to the non-intervention households, the intervention households had reduced levels of acetaldehyde, benzene, ethylbenzene, xylene and styrene. The reduction rate estimated from this comparative study was statistically significant(p<0.05). There was however no association between the intervention and the estimated PEFR between morning and evening data in asthma-patients.

The objective of the present study was to assess the health effect of houseplant. we selected 22 households of newly-built apartments and 17 asthma patients. Before intervention in the households, we conducted clinical survey investigations during April and October, 2006. In this study, 6 species of houseplants known to be eco-friendly and 14 other plants were recruited. While the clinical research items were lung function, erythrocyte sedimentation rate(ESR), white blood cell count(WBC), total eosinophil count(TEC) and total-immunoglobulin E(T-IgE). There was no association between the intervention and the estimated inflammation reaction and allergic reaction. However, peak expiratory flow rate(PEFR) of evening data were positive effect in the intervention asthma-patients households compared with the nonintervention.