Archives for June 2012

Stachybotrys chartarum- A Black Mould Of Many Controversies

Stachybotrys chartarum, also known by an old name as Stachybotrys atra, is a cellulose degrading fungus commonly found in soil and on materials rich in cellulose such as hay, straw, cereal grains, plant debris, wood pulp, paper, and cotton. It produces a mass of wet spores sticking together giving the appearance of black pin-heads. The […]

How To Interpret Laboratory Results for Airborne Fungal (Mould) Samples

Laboratory results for airborne mould and bacteria concentrations can be difficult to interpret for two major reasons. Maximum exposure limits have not been set Currently, there are no set maximum exposure limits (MELs) or threshold level values for airborne indoor mould and bacteria concentrations. Setting MELs would be difficult for reasons which include limitations in […]

How IAQ Professionals Can Improve Their Laboratory Reports

Currently there are no standardized methods for the analysis of indoor samples for microbial contamination. Neither are there guidelines for the limit of what is to be reported by laboratories and how to present the results. Without guidelines reports from different laboratories are difficult to compare. The quality of laboratory reports is also sometimes compromised. […]

Why Are Biocides Not Recommended for Mould Remediation?

The economic importance of biocides cannot be overemphasized. The world demand for these chemicals is projected to increase by 5.6% annually to $5.9 billion in 2006. Questions always arise as to whether biocides should be used or not in indoor mould remediation projects. This article is an attempt to explain why biocides may not be […]

Guidelines for Interpreting Numerical Data of Non-viable (Spore Traps) and Viable Airborne Mould Samples

In this article we discuss additional guidelines for interpreting numerical data for viable and non-viable airborne mould samples. The guidelines may be used to decide whether further investigations are required after initial investigations. However, numerical laboratory results cannot be used as the primary determinant of whether there is a mould problem but should always be […]

Sampling for Airborne Aspergillus species

Aspergillus is one the most common types of moulds in indoor environment. Some members of Aspergillus group are recognized health hazards and are of great concern if they appear in built environment. The most important species as concerns health are Aspergillus clavatus, Aspergillus fumigatus, Aspergillus niger and Aspergillus versicolor. Aspergillus clavatus is often associated with […]

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