Wood smoke in a controlled exposure experiment ...

Research studies on wood smoke and other air pollution.

Wood smoke in a controlled exposure experiment ...

Postby Wilberforce » Fri Apr 22, 2011 6:50 pm

Wood smoke in a controlled exposure experiment with human volunteers.
Riddervold IS, Bønløkke JH, Mølhave L, Massling A, Jensen B, Grønborg TK, Bossi R, Forchhammer L, Kjærgaard SK, Sigsgaard T.
Department of Environmental and Occupational Medicine, School of Public Health, Aarhus University, Aarhus, Denmark.
http://www.ncbi.nlm.nih.gov/pubmed/2150 ... t=Abstract

Abstract
Exposure to wood smoke in the general population is increasing and concurrently, also our awareness. This article describes a wood-smoke generating system for studying human exposure to wood smoke and symptoms related to this exposure. Twenty nonsmoking atopic human participants with normal lung function and normal bronchial reactivity were randomly exposed for 3 h at three different exposure conditions; clean filtered air (control exposure) and wood smoke with a characteristic particulate matter (PM) concentration of 200 µg/m(3) (low) and 400 µg/m(3) (high) under controlled environmental conditions. The range for PM(2.5) load observed for single experiments was 165-303 µg/m(3) for the low exposure and 205-662 µg/m(3) for the high exposure, whereas particle loads during clean air exposure most often were below the detection limit (<20 µg/m(3)). Health effects were evaluated in relation to rated changes in symptoms and environmental perception using a computerized questionnaire and a potentiometer. Subjective symptoms were generally weak, but when combining the effect of each of the symptoms into categorical symptom indices, significant effects were found for "environmental perception" (p = 0.0007), "irritative body perceptions" (p = 0.0127), "psychological/neurological effects" (p = 0.0075) and "weak inflammatory responses" (p = 0.0003). Furthermore, significant effects (p = 0.0192) on self-reported general mucosa irritation were found. In conclusion, exposure to wood smoke affected symptom rating and caused irritated mucosas in humans. The knowledge gained in this study on subjective-rated symptoms may be important for understanding human response to wood-smoke exposure.
• The Surgeon General has determined that there is no safe level of exposure to ambient smoke!

• If you smell even a subtle odor of smoke, you are being exposed to poisonous and carcinogenic chemical compounds!

• Even a brief exposure to smoke raises blood pressure, (no matter what your state of health) and can cause blood clotting, stroke, or heart attack in vulnerable people. Even children experience elevated blood pressure when exposed to smoke!

• Since smoke drastically weakens the lungs' immune system, avoiding smoke is one of the best ways to prevent colds, flu, bronchitis, or risk of an even more serious respiratory illness, such as pneumonia or tuberculosis! Does your child have the flu? Chances are they have been exposed to ambient smoke!
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