Fine particulate matter from wildfire smoke more harmful than pollution from other sources

https://www.eurekalert.org/pub_releases/2021-03/uoc--fpm030321.php

 

News Release 5-Mar-2021
University of California - San Diego

 

Researchers at Scripps Institution of Oceanography at UC San Diego examining 14 years of hospital admissions data conclude that the fine particles in wildfire smoke can be several times more harmful to human respiratory health than particulate matter from other sources such as car exhaust. While this distinction has been previously identified in laboratory experiments, the new study confirms it at the population level.

This new research work, focused on Southern California, reveals the risks of tiny airborne particles with diameters of up to 2.5 microns, about one-twentieth that of a human hair. These particles - termed PM2.5 - are the main component of wildfire smoke and can penetrate the human respiratory tract, enter the bloodstream and impair vital organs.


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A 10 microgram-per-cubic meter increase in PM2.5 attributed to sources other than wildfire smoke was estimated to increase respiratory hospital admissions by 1 percent. The same increase, when attributed to wildfire smoke, caused between a 1.3 to 10 percent increase in respiratory admissions.

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Coauthor Tom Corringham points to the implications for climate change: "As conditions in Southern California become hotter and drier, we expect to see increased wildfire activity. This study demonstrates that the harm due to wildfire smoke may be greater than previously thought, bolstering the argument for early wildfire detection systems and efforts to mitigate climate change."