Ozone removal, concentration of ultrafine particles (2 to 64 nm), and VOCs were measured on sooty ventilation filters. A F8 class filter loaded by diesel soot particles in a motor laboratory and a heavily loaded F5 class filter used for 8 months in a bus service terminal were used in the tests. In addition, both filters were saturated with alphapinene vapor to examine possible formation of secondary aerosols by heterogeneous reactions. Both filters removed ozone effectively in the beginning. Then, the removal efficiency declined until it reached a steady state level in three hours.

This study is in the frame of indoor air quality from the particle pollution point of view and its goal is to determine the particle penetration factor for different common types of leaks which deteriorate the filter capacity of building envelope. The most important parameters for the particle penetration are: the crack geometry, the pressure difference and the particles diameter. CFD numerical simulations have been done for rectangular cracks with 0.2mm and 1mm height for 40mm and 94mm length, also changing the pressure difference between 4Pa and 10Pa.

AIRSECURE project develops a protective solution against airborne threats for airport environment. The development efforts are based on risk analysis, and the developed technologies include high efficiency particle filtration, chemical filtration, detection of aerosol particles and hazardous chemicals

Three different air purifying devices are compared in terms of their influence on indoor air quality. Two systems use ozonisation and ionisation. One system uses ionisation and special filter devices (manufacturer's specifications). In the case of ozone production the perceived intensity and the PD value will increase to inacceptable values. The chemical analyses shows that the increase aldehyde concentration is probably caused by surface reactions between material and ozone.

This paper reviews indoor air quality needs; then it addresses gas phase air cleaning (a little understood, little used in HVAC, high opportunity technology) - particularly by adsorption. Opportunities and limitations are discussed and the capital and energy cost impacts of use are detailed. The role of ventilation/IAQ standards is addressed.

A satisfactory indoor air quality (IAQ) relies, amongst other things, on the availability of clean ventilation air. The outdoor air cleanliness in many urban environments is far from optimum. Fine particles (FPs = 2.5 m) and certainly ultra-fine particles (UFPs = 0.3 m) feature prominently as hazardous constituents of common urban air pollution.

We have performed studies onboard cruise ship to study the particle number concentrations,the commonly used filters and the utilization of novel filtration technologies. We observed that the majority of particles in the indoor air of a ship - and this applies when the ship was sailing in clean or polluted outdoor air - are smaller than 1 micron). We also observed that the commonly used filters mainly filtered particles larger than 1 micron.

While being used for years in industrial applications, gaseous contaminant sorption units suchas activated-carbon filters remain marginal in office and residential buildings. This study deals with models that could help building designers and administrators to design and maintain activated-carbon filters depending on the environmental conditions (pollution load, airflow rate, temperature, humidity) they operate.

This is one of two CLIMA 2007 papers on gas phase air cleaning by this author. The Science of Gas Phase Air Cleaning’ covers aspects of air quality, gas phase air cleaning (particularly adsorption) limitations and opportunities, capital and energy saving

The application of a ventilation system in a new building is a multidimensional complex problem that involves both quantifiable and non-quantifiable data e.g. energy consumption, indoor environment, building integration and architectural expression. This paper presents a structured method for evaluating the performance of a ventilation system in the design process by treating quantifiable and non-quantifiable datasets together.