J. Appl. Environ. Biol. Sci., 2(12)625-633, 2012 © 2012, TextRoad Publication ISSN 2090-4274 Journal of Applied Environmental and Biological Sciences www.textroad.com Corresponding Author: Indri Santiasih, Department of Safety Engineering, Surabaya Shipbuilding Polytechnic, ITS campus Sukolilo, Surabaya Indonesia 60111. Email: indri.santiasih@gmail.com Indoor Particulate Matters Dispersion Potency Indri Santiasih 1, *, Joni Hermana 2 and Didik Bambang Supriadi 2 1 Department of Safety Engineering, Surabaya Shipbuilding Polytechnic, ITS campus Sukolilo, Surabaya Indonesia 60111 2 Department of Environmental Engineering, Sepuluh Nopember Institute of Technology. ITS campus Sukolilo, Surabaya Indonesia 60111 ABSTRACT This research was conducted by means of particulate matters (PM 10 and PM 2,5 ) emission from wood surface coating process with the objectives to verify that the material balance could be used to estimate indoor particulate matters concentration and to verify the correlation between particulate matters with microorganisms concentration. The material balance was calculated from the emission rates and air flow rates, where the model goodness of fits was calculated by the root mean square error (RMSE). The correlation between particulate matters and microorganisms were analysed with linier regression. The results showed that the material balance could be used to estimate indoor particulate matters concentration. Respectively there were sufficient evidence of correlation between the concentration of PM 10 and PM 2,5 with the concentration of microorganism, where R 2 fungi more significant than R 2 bacteria . Keywords: Particulate matters, PM 10 and PM 2,5 , indoor, microorganism, bacteria, fungi INTRODUCTION Surface coating is an application of decorative or protective materials in liquid or powder form to substrates. These coatings normally include general solvent type paints, varnishes, lacquers, and water thinned paints. After application of coating by 1 of a variety of methods such as brushing, rolling, spraying, dipping and flow coating, the surface is air and/or heat dried to remove the volatile solvents from the coated surface. Powder type coatings can be applied to a hot surface or can be melted after application and caused to flow together. Other coatings can be polymerized after application by thermal curing with infrared or electron beam systems [29]. Particulate matter (PM) constitutes are a major class of air pollution. Particulates comes in a variety shape and sizes, and can be either liquid droplets or dry dusts, with wide range of physical and chemical properties. Particulates are emitted from many different sources, including surface coating processes [5]. The activities produced particulate matter significantly are abrasive blasting and painting process. While blasting with abrasive materials is often conducted in contained environments, there are situations where state agencies allow unconfined blasting. In both scenarios particulates are released to the environment, therefore there is a need to estimate the potential risk on humans and the environment from the toxic metals in the particulate releases from this unit operation [27]. Painting involves the application of decorative or protective materials onto the surface of a substrate. These decorative or protective materials can be in the form of a primer, sealant, finish coat, or another type of material such as an anti-corrosion coating. The coating material will have different components and properties depending on its intended use. Paint will usually consist of a binder, a pigment, a solvent or thinner, and a drier. Paint may also be solvent- or water-based. Most paint spray-gun operations take place in a paint booth. A pressurised spray gun applies the paint as a fine mist or aerosol [22]. The spray painting more dangerous than conventional painting with brush, because at the spray painting, the small particulates could spread broadly [1]. Mass Balance Models for Indoor Air Quality Indoor concentration of air contaminants can be predicted by simple mathematical models. The key variables are emission rates and ventilation rates. In some buildings, the airflow is very simple, and can be assumed the whole buildings acts likes a single, well-mixed room. For other situasion, it be might have to model the building as many such rooms connected in series and parallel [5]. The estimation methods with mass balance models useful when other developed methods are not available or practical, besides that it is useful for sources resulting in evaporative losses and it can be assumed that 100% solvent relesases in the air by evaporation [31]. There are tree methods to estimate the exposure conventionally including non directly methods [15] where the pollutant levels 625