Trial of a negative ion generator device in remediating problems related to indoor air quality.
It has been suggested that supplementation of indoor air with negative ions can improve air quality. This study examined the effects of a "negative ion-generator" device on air contaminants and symptom reporting in two office buildings. Separate sets of functional and nonfunctional negative ion generators were monitored using a double blind, crossover design involving two 5-week exposure periods. There were no detectable direct or residual effects of negative ion generator use on air ion levels, airborn particulates, carbon dioxide levels, or symptom reporting. Symptom reporting declined at both sites initially and appeared to be consistent with placebo effect. Job dissatisfaction was an apparent contributor to symptom reporting, with a magnitude comparable to presumed effects of air quality. Further testing of such devices is needed before they should be considered for office air quality problems.
Daniell
W
W
Department of Environmental Health, University of Washington, Seattle 98195.
Camp
J
J
Horstman
S
S
D000328:Adult; D000389:Air Conditioning / Q000379:methods*; D000390:Air Ionization; D000393:Air Pollutants / Q000032:analysis; D001294:Attitude to Health; D002245:Carbon Dioxide / Q000032:analysis; D004311:Double-Blind Method; D004781:Environmental Exposure / Q000517:prevention & control; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007588:Job Satisfaction; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology / Q000517:prevention & control*; D014691:Ventilation; D014861:Washington / Q000453:epidemiology
D000393:Air Pollutants; D002245:Carbon Dioxide