TOTAL DUST EXPOSURE AND SIZE DISTRIBUTION OF AIR BORNE PARTICLES IN DAY-CARE CENTRES, SCHOOLS AND OFFICES

摘要

Values for total dust concentration in indoor air in day-care centres, offices and schools with no reported problems are measured. These are day-care centres 41 +- 14 μg/m~3 offices 16 +- 5 μg/m~3 schools 20 +- 10μg/m~3 In parallel the particle size distribution in six interval from 0.3 μm - >20 μm are reported. No seasonal variation in total dust concentration could be seen. Sudden increase in number of the particles in the smallest intervals are found at night for some systems when they are shut down or working on reduced speed.