ECA 12: Biological particles in indoor environments.

This report is concerned with the strategy and methodology for investigating four major categories of biological particles in the indoor air of private houses, non-industrial workplaces and public buildings (excluding hospitals). These particles are mites and their faeces; dander from pets and other furred animals; fungi, including moulds and yeasts; and bacteria, including actinomycetes. For each of these categories the following items have been considered: health effects; occurrence; available sampling methods; available methods of analysis; recommendations for different studies; and observed values and evaluation of results. Health effects, occurrence and sampling and analysis of Legionella are also briefly discussed.