ABSTRACT
Some small spaces with the intensive populations, such as hospital, conference rooms and movie theaters usually gather a lot of microorganisms and bacteria. In these environments, bacteria easily breed and spread by droplets or mosquito bites. If a man works frequently in these kinds of situations, the health of human will be aected seriously. The human life and production process will inevitably produce a variety of harmful gases. Indoor decorative paint, man-made wood furniture and decorative textiles can long-term release harmful gases, such as formaldehyde, benzene series, gas leakage, the combustion of various fuels, cooking oil fume and SO2.
