Exposure to Household Air Pollution from Wood Combustion

Research studies on wood smoke and other air pollution.

Exposure to Household Air Pollution from Wood Combustion

Postby Wilberforce » Mon Jan 19, 2015 3:44 pm

Exposure to Household Air Pollution from Wood Combustion and Association with Respiratory Symptoms
and Lung Function in Nonsmoking Women: Results from the RESPIRE Trial, Guatemala
http://ehsdiv.sph.berkeley.edu/krsmith/ ... on_EHP.pdf

Background: With 40% of the World’s population relying on solid fuel, household air pollution
(HAP) represents a major preventable risk factor for COPD. Meta-analyses have confirmed this
relationship, however constituent studies are observational with virtually none measuring
exposure directly.

Objectives: We estimated associations between HAP exposure and respiratory symptoms and
lung function in young, non-smoking women in rural Guatemala, using measured CO
concentrations in exhaled breath and personal air to assess exposure.

Methods: The Randomised Exposure Study of Pollution Indoors and Respiratory Effects
(RESPIRE) Guatemala study was a trial comparing respiratory outcomes among 504 women
using improved chimney stoves versus traditional cookstoves. The present analysis included 456
women with data from post-intervention surveys including 6-monthly interviews (respiratory
symptoms), spirometry and CO (ppm) in exhaled breath measurements. Personal CO was
measured using passive diffusion tubes at variable times during the study. Associations between
CO concentrations and respiratory health were estimated using random intercept regression

Results: Respiratory symptoms (cough, phlegm, wheeze or chest tightness) during the previous
six months were positively associated with breath CO measured at the same time of symptom
reporting and with average personal CO concentrations during the follow-up period. CO in
exhaled breath at the same time as spirometry was associated with lower lung function [average
reduction in FEV1 (in mL) for a 10% increase in CO was 3.33 mL (95% CI: -0.86, -5.81)]. Lung
function measures were not significantly associated with average post-intervention personal CO

Conclusions: Our results provide further support for the effects of HAP exposures on airway
inflammation. Further longitudinal research modelling continuous exposure to particulate matter
against lung function will help understand more fully the impact of HAP on COPD.


Indoor air quality guidelines: household fuel combustion; World Health Organization: Geneva, Switzerland. 2014.
www.who.int/entity/indoorair/guidelines ... ov2014.pdf

• 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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