Indoor air quality (IAQ) has become a major concern nowadays because of the universality of exposure and its potential negative impact on human health especially on children. This study is intended to explore the association between IAQ and the respiratory health among preschool children in urban and suburban area. A cross-sectional comparative study was carried out among Malay preschool children in urban (N= 60, Puchong) and suburban (N=60, Hulu Langat) areas. An indoor air quality assessment was conducted in 12 preschools and 60 houses which include parameters of PM2.5, PM10, VOCs, mold, bacteria, Gram-negative bacteria and physical parameters. A set of standardized questionnaire was distributed to obtain respondents’ background information, exposure history and respiratory health symptoms. Spirometry test was carried out and the data obtained were analyzed to determine the lung function of the respondents. There was a significant difference between IAQ in urban and suburban preschools for all parameters measured (p<0.05). Most of the pollutants were significantly associated with respiratory health symptoms. There was a significant association between the level of indoor pollutants with the lung function abnormalities among the respondents. Even though this study is the first to take Gram-negative bacteria as an indoor air pollutant, the finding also shows that there is a significant association between exposure of Gram-negative bacteria with lung function impairment and higher reported respiratory symptoms among the respondents. The finding concluded that exposures to indoor air pollutants, especially PM2.5 increases the risk of getting lung function abnormality and respiratory health symptoms among respondents.

Indoor air quality (IAQ) has become a major concern nowadays because of the universality of exposure and its potential negative impact on human health especially on children. This study is intended to explore the association between IAQ and the respiratory health among preschool children in urban and suburban area. A cross-sectional comparative study was carried out among Malay preschool children in urban (N= 60, Puchong) and suburban (N=60, Hulu Langat) areas. An indoor air quality assessment was conducted in 12 preschools and 60 houses which include parameters of PM2.5, PM10, VOCs, mold, bacteria, Gram-negative bacteria and physical parameters. A set of standardized questionnaire was distributed to obtain respondents’ background information, exposure history and respiratory health symptoms. Spirometry test was carried out and the data obtained were analyzed to determine the lung function of the respondents. There was a significant difference between IAQ in urban and suburban preschools for all parameters measured (p<0.05). Most of the pollutants were significantly associated with respiratory health symptoms. There was a significant association between the level of indoor pollutants with the lung function abnormalities among the respondents. Even though this study is the first to take Gram-negative bacteria as an indoor air pollutant, the finding also shows that there is a significant association between exposure of Gram-negative bacteria with lung function impairment and higher reported respiratory symptoms among the respondents. The finding concluded that exposures to indoor air pollutants, especially PM2.5 increases the risk of getting lung function abnormality and respiratory health symptoms among respondents.
Indoor air quality ; mold ; bacteria ; lung function ; respiratory health symptoms

Introduction: In understanding of the general public’s knowledge, attitude and practice (KAP) on the returning and disposal of unused medications is imperative towards the designing of better educational materials and policy development. The objectives of this study was to validate the Malay version of the Return and Disposal of Unused Medications (ReDiUM) questionnaire for use among Malaysian as well as to gain an understanding on these patterns of behaviour among Malaysians. Methods: The English version of the ReDiUM was translated into Malay language according to international guidelines. Content and face validity of the questionnaire was examined by experts. Subsequently, the questionnaire was pilot tested in 10 native speakers. Reliability was assessed using Cronbach’s alpha coefficients. The test-retest reliability was measured with Spearman’s Correlation Coefficient and Cohen’s κ coefficient. Public were recruited through convenient sampling for the study. Results: The study recruited 319 respondents. For test-retest reliability, all the correlation coefficient values were >0.5 indicating strong reliability (26 respondents). Except few items, most of the kappa coefficients were >0.61 indicating substantial to almost perfect agreement. Cronbach’s alpha of the KAP domains were 0.585, 0.770 and 0.759, respectively. The median knowledge score was only 50% with some negative attitudes and practices found. Conclusions: The translated questionnaire was valid and reliable for use in Malaysia with acceptable to strong internal consistency and most items with substantial to almost perfect agreement. The findings from the study provide supporting evidence for policy makers to develop interventions to help with reducing wastage and optimize healthcare expenditure.