Levels and predictors of endotoxin in mattress dust samples from East and West German homes

In so far as prevalence of asthma and allergies is different from East to West Germany, a suggestion that it was associated with lifestyle factors was made. The endotoxin levels in dust collected from more than 4000 infants and mothers mattresses were compared. But none of the predictors analyzed and even a combination of predictors can be used as a surrogate for high or low mattress dust endotoxin levels in epidemiological studies.

Comparison of two dust collection methods for reservoir indoor allergens and endotoxin on carpets and mattresses

The aim of this paper was to examine the effect of two different dust collection devices, widely used in epidemiological studies. The device used for dust sampling has a significant influence on the amount of dust collected and may lead to uncertainty in the measurement of biomarkers.

A pilot study to identify semi-volatile organic pollutants in residential house dust

Semi-volatile organic compounds (SVOCs), emitted from building materials and othersources in the indoor environments, are likely to be bound to particulates due to theirrelatively low vapour pressure. While toxic metals and biological pollutants in house dusthave been investigated in several studies, little work has been done to detect SVOCs. In thispaper, the preliminary results on the screening of SVOCs in house dust in selected sixresidential homes are presented. The dust particles (

Increased levels of bacterial markers and CO2 in occupied schools

The aim of this study was to test the following hypthesis : in schools, bacterial markers may be increased in indoor air because of the presence of children.Dust samples were collected from the school rooms when occupied but also when unoccupied during the week-end. Results have been analysed and the conclusion is that in unoccupied rooms the airborne dust is of environmental origin, whereas the increase level of dust in occupied rooms is due to the children presence.

Field evaluation and comparison of five methods of sampling lead dust on carpets

Five methods of sampling lead dust where tested for that study in 33 New Jersey homes of children with blood problems.Samples were collected on the carpets of the different homes. Among the five sampling methods used then compared (wipe, adhesive label, C18 sheet, vacuum, hand rinse) the first one appeared the most appropriate for measuring lead from carpets for exposure assessment, and vacuum the most recommended for collecting information on total lead accumulation.

Dust : a metric for use in residential and building exposure assessment and source characterization

The use of house dust is studied to identify sources and quantify levels of toxicants for the estimation of exposure. Sampling strategies were examined, just as uncertainty and lack of knowledge. The presentation of the results of sampling is also discussed. This article describes case studies.

Indoor air quality in the university libraries of Modena (Italy)

A survey was carried out in 16 libraries in Modena University (Northern Italy) to assess the indoor exposure to Volatile Organic Compounds. VOCs were present in all the investigated libraries.The conclusion of that study is that no major problems were related to indoor pollution but the identification of the possible sources of contaminants is important, just as a definition of the relationship between indoor and outdoor levels of pollutants : that will take into account the effects of air recycling due to natural ventilation systems.

Improve energy and comfort performance of large office buildings using integrated interior and exterior zone air-handling units

The interior zone and exterior zone air-handling units (AHU) can be connected through their return air ducts to become a new air-handling unit system, named OAHU system, which allows optimal choice of outside air intake and decouples sensible and latent cooling in a zone with lower sensible

The effect of cleanliness control during installation work on the amount of accumulated dust in ducts of new HVAC installations

A contaminated supply air system may have an adverse effect on indoor air quality. The aim of that study was to evaluate the effectiveness of different protective actions in achieving a clean supply air duct system on the one hand and to find out the location in the ductwork where most of the duct is accumulated. Measurements were made and presented in tables.
It appears that dust accumulation can be partly avoided by ducts protection during the whole of the construction transportation and storage phases and that no ducts with residual oil on the inner surface should be used.

Deposition of aerosol particles in ventilation ducts

In this work, experiments were carried out to estimate deposition rate of 5µm particles powder in large cylindrical straight ducts for different diameters. Two types of ducts were compared: rigid ducts and flexible ducts. Results are compared to theoretic