The effects of intervention with local electrostatic air cleaners on airborne dust and the health of office employees.

UNLABELLED The aim of this intervention study was to identify any health improvements in the upper and lower airways of office workers after the installation of local electrostatic air cleaners. Eighty persons with airways symptoms were recruited and randomly assigned to an intervention or control group. Half of the air cleaners had a non-functioning electrostatic unit. Both participants and field researchers were blinded to the group status. Subjective symptoms were recorded using a questionnaire, and indexes calculated for general, irritation and skin symptoms. Objective respiratory health indicators were recorded, with acoustic rhinometry and peak expiratory flow (PEF) meters. In the intervention group there was a decrease in mean dust concentration from 65 to 35 microg/m(3), and a reduction from 57 to 47 microg/m(3) in the control group (P < 0.05 for difference in decline). The reduction was observed for all particles sizes. The irritation and general symptom indices decreased in both groups, but there was no improvement in the intervention group, compared with the control group. Median PEF increased 3 ml/s in the intervention group, and decreased 4 ml/s in the control group. The adjusted odds ratio for an increase above the 70th percentile was 5.7 (95% CI 1.0-32). PRACTICAL IMPLICATIONS Electrostatic air cleaners can reduce the dust concentration effectively in the office environment. Small, medium and large sized particles can be reduced by approximately 50%, relatively most effectively for the respirable particles. However, the air cleaners tested in this study produced an annoying fan noise. Cleaning efficiency and noise data should be given consideration before installation. This experimental field study suggests that office workers with airways symptoms may benefit from installation of local electrostatic air cleaners.

[1]  Knut Skyberg,et al.  The Effect of Cleaning on Dust and the Health of Office Workers: An Intervention Study , 2004, Epidemiology.

[2]  W Eduard,et al.  Symptoms prevalence among office employees and associations to building characteristics. , 2003, Indoor air.

[3]  T Schneider,et al.  'EUROPART'. Airborne particles in the indoor environment. A European interdisciplinary review of scientific evidence on associations between exposure to particles in buildings and health effects. , 2003, Indoor air.

[4]  Hideki Ohira,et al.  Effect of negative air ions on computer operation, anxiety and salivary chromogranin A-like immunoreactivity. , 2002, International journal of psychophysiology : official journal of the International Organization of Psychophysiology.

[5]  P Wargocki,et al.  Subjective perceptions, symptom intensity and performance: a comparison of two independent studies, both changing similarly the pollution load in an office. , 2002, Indoor air.

[6]  O Seppänen,et al.  Ventilation and health in non-industrial indoor environments: report from a European multidisciplinary scientific consensus meeting (EUROVEN). , 2002, Indoor air.

[7]  O Seppänen,et al.  Association of ventilation system type with SBS symptoms in office workers. , 2002, Indoor air.

[8]  Djupesland Pg,et al.  Accuracy of acoustic rhinometry. , 2001 .

[9]  B Croxford,et al.  A study of local electrostatic filtration and main pre-filtration on airborne and surface dust levels in air-conditioned office premises. , 2000, Indoor air.

[10]  L. Mølhave,et al.  Reactions of healthy persons and persons suffering from allergic rhinitis when exposed to office dust. , 1999, Scandinavian journal of work, environment & health.

[11]  Peter Dingle,et al.  Particulate Matter Intervention Study: A Causal Factor of Building‐Related Symptoms in an Older Building , 1998 .

[12]  J. Colls,et al.  The Influence of Human Activity on the Vertical Distribution of Airborne Particle Concentration in Confined Environments: Preliminary Results , 1998 .

[13]  Dan Norbäck,et al.  Nasal Mucosal Swelling in Relation to Low Air Exchange Rate in Schools , 1997 .

[14]  Karin Foarde,et al.  Cleaning for Improved Indoor Air Quality: an Initial Assessment of Effectiveness , 1997 .

[15]  James H. Vincent,et al.  Aerosol Science for Industrial Hygienists , 1995 .

[16]  Peder Wolkoff,et al.  Dust and the sick building syndrome , 1994 .

[17]  Jan Sundell,et al.  A Prevalence Study Of The Sick Building Syndrome (SBS) And Facial Skin Symptoms In Office Workers , 1993 .

[18]  David Peter Wyon,et al.  Sick buildings and the experimental approach , 1992 .

[19]  A. Grøntved.  The clinical significance, diagnosis and treatment of bulla formation in the nose. , 1978, Rhinology.