Mortality Attributable to Smoke from Landscape Fires

Research studies on wood smoke and other air pollution.

Mortality Attributable to Smoke from Landscape Fires

Postby Wilberforce » Mon Feb 20, 2012 8:30 pm

Estimated Global Mortality Attributable to Smoke from Landscape Fires
Fay H. Johnston, Sarah B. Henderson, Yang Chen, James T. Randerson, Miriam Marlier, Ruth S. DeFries, Patrick Kinney, David M.J.S. Bowman, Michael Brauer
http://ehp03.niehs.nih.gov/article/fetc ... hp.1104422
Background: Forest, grass and peat fires release approximately two petagrams of carbon into the atmosphere each year, influencing weather, climate, and air quality.

Objective: To estimate the annual global mortality attributable to landscape fire smoke (LFS).

Methods: Daily and annual exposure to particulate matter < 2.5 micrometers (PM2.5) from fire emissions was estimated globally for 1997-2006 by combining outputs from a chemical transport model with satellite-based observations of aerosol optical depth. In World Health Organization (WHO) subregions classified as sporadically impacted, the daily burden of mortality was estimated using previously published concentration-response coefficients for the association between short-term elevations in PM2.5 from LFS (contrasted with 0 μg/m3 from LFS) and all-cause mortality. In subregions classified as chronically impacted, the annual burden of mortality was estimated using the American Cancer Society study coefficient for the association between long-term PM2.5 exposure and all-cause mortality. The annual average PM2.5 estimates were contrasted with theoretical minimum (counterfactual) concentrations in each chronically impacted subregion. Sensitivity of mortality estimates to different exposure assessments, counterfactual estimates, and concentration-response functions was evaluated. Strong La Niña and El Niño years were compared to assess the influence of inter-annual climatic variability.

Results: Our principal estimate for the average mortality attributable to LFS exposure was 339,000 deaths annually. In sensitivity analyses the interquartile range of all tested estimates was 260,000 to 600,000. The regions most affected were Sub-Saharan Africa (157,000) and Southeast Asia (110,000). Estimated annual mortality during La Niña was 262,000 compared with 532,000 during El Niño.

Conclusions: Fire emissions are an important contributor to global mortality. Adverse health outcomes associated with LFS could be substantially reduced by curtailing burning of tropical rainforests, which rarely burn naturally. The large estimated influence of El Niño suggests a relationship between climate and the burden of mortality attributable to LFS.


Citation: Johnston FH, Henderson SB, Chen Y, Randerson JT, Marlier M, DeFries RS, et al. 2012. Estimated Global Mortality Attributable to Smoke from Landscape Fires. Environ Health Perspect :-. http://dx.doi.org/10.1289/ehp.1104422

Received: 30 August 2011; Accepted: 13 February 2012; Online: 18 February 2012
• 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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