Formaldehyde (FA) adsorption, including that in the presence of water vapours, has been evaluated on adsorbents of various nature and porous structure. The efficiency of porous adsorbents (active carbons, silica-gels) with a pore size of 2-200 nm, providing rapid adsorption of low FA concentrations from dry air and a high sorption from the FA water mixture, has been demonstrated. Recommendations on the practical use of adsorbents for indoor purification have been given.

The role of indoor plants as a source of microorganisms was studied in six office rooms.Concentrations of microorganisms (both fungi and actinomycetes) were determined fromindoor air and settled dust before the plants were placed in the office rooms and afterwardswith the plants in the rooms.

Indoor air quality is decreasing year by year. It is very necessary to find a kind of efficient cleaner to improve the indoor air quality. Two kinds of cleaners were tested. Both of them were made in China. Four simulated chambers were used. The research was performed with monitoring and toxicological tests. The results showed the cleaner A absorbed and filtered smoke very fast. But CO and CH2O could not have been absorbed and filtered. Cleaner B either could absorb smoke or could exchange air with outdoor air. The cleaning efficiency of cleaner B is better than that of cleaner B.

Photocatalytic degradation of volatile organic compounds (VOC) with short-wavelength UVlight (254 nm) is an attractive technique in the view of perfect mineralization to CO2. In thisstudy, shorter wavelength of UV light involving 185 nm which generates O3 was used as a lightsource, and as a photocatalyst, titanium dioxide (TiO2) and its mixture with ozonedecomposition catalyst (ODC) was tested to improve photocatalytic activity. Their validity wasevaluated from the removal ratio of toluene by photocatalysis and the size distribution ofgenerated particles by gas-to-particle conversion.

This study is part of an investigation of the decontamination capabilities of indoor plants.Three internationally used species, Howea forsteriana Becc. (Kentia Palm), Dracaenaderemensis Eng. Janet Craig, and Spathiphyllum Petite (Peace Lily), were evaluated for theability to reduce or remove benzene and n-hexane from indoor air. Plants tested in bothpotting media and hydroponic conditions removed the individual VOCs at concentrationsequal to 2 and 5 times the maximum occupational exposure levels recommended by theWorksafe Australia Time-weighted average exposure standard (TWA), [1].

The goal of this study was to investigate the effectiveness of stand-alone modular airpurification systems in improving air quality in dental practices and certain hospital andlaboratory environments. As air pollutant make-up and concentration may vary significantlyin different indoor enviromnents, the air cleaning technologies utilised should be optimisedfor the pollutants targeted in a particular environment. Reduction of mercury vapours andformaldehyde were examined because of their importance for indoor air quality in dentalpractices.

Air cleaners are unitary devices that contain filtration media and fans. They are marketed for cleaning air in rooms. There is no current method for measuring the effectiveness of these devices in rooms of the size where they are typically installed. The proposed method provides engineers and manufacturers with a tool for evaluating and predicting applied air cleaner performance. Test results provide the effective ventilation rate of the device. This rate can be stated in terms of the whole room average, or for specific regions of concern, such as work areas, within the room.

Avariety of gaseous pollutants in indoor air now are becoming an object to control. Thus, westudied a removal technique using TiO2 photocatalyst under 365 nm or 254 nm UV-lightirradiation for toluene, benzene, formaldehyde and acetaldehyde as examples of hazardousvolatile organic compounds (VOCS), in order to get detailed analytical data for productsderived from these contaminants. Although these compounds were effectively destructed, notonly CO2 but also high concentration of toxic compounds, such as aldehydes were formed inthe case of under 365 nm UV-light irradiation.

Airborne fungi in indoor air has the possibility to cause the air pollution problems of the fungally infection syndrome and the allergy syndrome, etc. in residence environments. Because the carcass of airborne fungi becomes and allergen, it is difficult to remove the allergen effectively only by mere sterilisation. In this research, the pyrolysis of fungi was examined by using the heat of the high temperature from the heater used the combustion of natural gas.

As a result of the recent resurgence in tuberculosis (TB), there has been renewed interest inengineering controls to reduce the spread of TB and other airborne infectious diseases in highrisk settings. This paper presents the results of experimental studies evaluating the efficacy ofultraviolet germicidal irradiation (UVGI) of room air in reducing the concentration of viableairborne bacteria. Bacterial particles (Bacillus subtilis spores and Mycobacteriumparafortuitum) were continuously generated in a 90m room.