Museums were established in Malaysia more than a hundred years ago. Since the year 2005, Malaysian government has discouraged constructing new purposely built museums in favour of refurbishing historic and old buildings to function as adaptive reused museums. Commonly due to insufficient ventilation, fully mechanically ventilated museums can pose critical indoor environmental issues that may lead to health hazards and risks among employees and visitors. Thus, the purpose of this study is to determine the potential risk factors within the museums based on indoor environmental criteria. This potential risk factors are resulted from the 'Potential Risk Categories', which have been developed by adopting the established Hazard Identification, Risks Assessment and Risk Control (HIRARC) Method. Based on the assessment of four main indoor environmental criteria in the Potential Risk Categories, it was discovered that 8 out of 24 museums are in the range of medium potential risk, while the rest of them are in the range of low potential risk. The 'Potential Risk Categories' is important for assessing indoor environment at the museums whereby the most critical risk could be assessed, and then suggestion could be provided to minimize the potential risk within the spaces inside the museums.

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Abstract. Reasonable grounds that human needs the plants because their abilities reduce carbon dioxide (CO 2 ). However, it is not constantly human with the plants, especially in the building. This paper intends to study the abilities of seven plants (Anthurium, Dumb Cane, Golden Pothos, Prayer Plants, Spider Plant, and Syngonium) to absorb CO 2 gas. The research was conducted in chambers (one cubic meter) with temperature, lux intensity and CO 2 concentration at 25±10C, 300 lux, and 450±10 ppm. Before experimental were carried out, all plants selected should be assimilated with an indoor setting for performance purpose, and the experiment was conducted during daytime (9 am-5 pm). The experiments run in triplicate. Based on the results that are using extremely low light that ever conducted on plants, only Spider Plants are not capable to absorb CO 2 , instead turn up the CO 2 rate during respiration. Meanwhile, Prayer Plant is the most plant performed with CO 2 reduction is 7.62%, and this plant also has equivalent results in triplicate study based on an ANOVA test with significant value at 0.072. The conclusions of this research, only Spider Plant cannot survive at indoor condition with extremely low light for plants live and reduce CO 2 concentration for indoor air quality (IAQ). The rate of 300 lux is a minimum light at indoor that are set by the Department of Occupational Safety and Health (DOSH, Malaysia).