A case study is presented in this paper regarding the fine particulate matter and its carbonaceous compositions in six residential homes in Hong Kong. The characteristics and relationship of Organic Carbon and Elemental Carbon have been discussed indoors and outdoors. A simple model indicated that carbonaceous particles found indoors consist of about 2/3 of outdoor sources and 1/3 of indoor sources.

Porous building materials are sources of indoor air pollutants such as VOCs and strong sinks of these pollutants too. To control the indoor VOC concentration levels and to determine the best ventilation requirements for an acceptable IAQ, the knowledge of VOC transfer mechanisms in these materials is a necessary step. The analytical model presented in this paper can predict both primary and secondary VOC source or sink behavior of porous building materials.

For that study, 1014 pupils from 8 schools were questionned in the aim to study asthma and allergy in relation to diet and the school environment. Most of the classrooms fulfilled the ventilation standard, but despite that, cat, dog and horse allergens were found at high level in most of the classrooms. The authors also found interaction between dietary factors and allergen levels.

Identifying health improvements in the upper and lower airways of office workers was the aim of that experimental field study. The results show that the installation of electrostatic air cleaners reduces the total airborne dust concentration in offices by up to 46 % . That reduction is observable for all particle sizes.

For that study a seated computational thermal manikin (CTM) is used to study the microenvironment around human body with or wihtout personalized ventilation system (PV). The introduction of Pollutant exposure reduction and personalized air utilisation efficiency as new evaluation indices has been made.

Concerning house ventilation, occupants are aware of the necessity of suppressing the vicious air but less of the obligation of entering outside air. For cost savings, air-intake for ventilation is generally located on the frame of windows, but the author thinks it is wrong, it ought to be positioned either in the concrete or in the shutter coffer to get windows thermally and acoustically performant.

The characteristics of the building that has been renoved according to the german standard "pasive house", are presented. A comparison of the energy consumption has been made between the existing building and the renoved one : it is 85 % lower for the renoved building. All the more, the rehabilitation brings comfort for the user, is satisfactory on an ecological point of view and economically optimised.

First the author asserts that the filtration with the help of fiber means is the most widely used technique for the treatment of the particle-pollution. Then he gives a clear and general information about the particle filtration with fiber-filters with their advantages and drawbacks. In conclusion, he precises that it is difficult to forecast the life time of those filters and to know how they behave with nano particles.

The principle of displacement ventilation involves air supply and distribution in a room by upwards displacement, i.e. as direct as possible through-flow in the occupied zone in order to achieve high ventilation efficiency. In addition, air distribution by displacement generally makes it possible to supply a larger quantity of air than for conventional mixing ventilation, which requires concentrated supply at high velocity.

For that study, the constant concentration dosing method and the decay method were used to test air changes performances in an office equiped with a VAV mechanical ventilation system and in a domestic apartment with natural ventilation . The measurement results from those two tracer gas methods are compared.