Wildfires Emit Mercury

Facts matter: Sign up for the free Mother Jones Daily newsletter. Support our nonprofit reporting. Subscribe to our print magazine.


31846674_1755653108_m.jpg Forest fires and other blazes in the US release about 30 percent as much mercury as the nation’s industrial sources. Initial estimates from the National Center for Atmospheric Research find that fires in Alaska, California, Oregon, Louisiana, and Florida emit particularly large quantities of the toxic metal, and the Southeast emits more than any other region. The mercury released by forest fires originally comes from industrial and natural sources.

The researchers estimate that fires in the continental US and Alaska release about 44 metric tons of mercury into the atmosphere yearly. They caution their estimates are preliminary and subject to a 50 percent or greater margin of error. A next step will be to examine how much mercury is deposited on nearby downwind areas, compared to how much travels around the hemisphere. Most mercury from fire is gaseous, traveling thousands of miles before coming down in rain or snow. About 15 percent is associated with airborne particles, like soot, some of which may fall to Earth near the fire. “We would like to determine the risk of mercury exposure for residents who live downwind of large-scale fires,” says author Hans Friedli.

Even more disturbing in light of the fact that the number and extent of wildfires are forecast to increase—and in fact already are—another pesky byproduct of global warming.

Julia Whitty is Mother Jones’ environmental correspondent. You can read from her new book, The Fragile Edge, and other writings, here.

REAL QUICK, REAL URGENT

Minority rule, corruption, disinformation, attacks on those who dare tell the truth: There is a direct line from what's happening in Russia and Ukraine to what's happening here at home. And that's what MoJo's Monika Bauerlein writes about in "Their Fight Is Our Fight" to unpack the information war we find ourselves in and share a few examples to show why the power of independent, reader-supported journalism is such a threat to authoritarians.

Corrupt leaders the world over can (and will) try to shut down the truth, but when the truth has millions of people on its side, you can't keep it down for good. And there's no more powerful or urgent argument for your support of Mother Jones' journalism right now than that. We need to raise about $450,000 to hit our online fundraising budget in these next few months, so please read more from Monika and pitch in if you can.

payment methods

REAL QUICK, REAL URGENT

Minority rule, corruption, disinformation, attacks on those who dare tell the truth: There is a direct line from what's happening in Russia and Ukraine to what's happening here at home. And that's what MoJo's Monika Bauerlein writes about in "Their Fight Is Our Fight" to unpack the information war we find ourselves in and share a few examples to show why the power of independent, reader-supported journalism is such a threat to authoritarians.

Corrupt leaders the world over can (and will) try to shut down the truth, but when the truth has millions of people on its side, you can't keep it down for good. And there's no more powerful or urgent argument for your support of Mother Jones' journalism right now than that. We need to raise about $450,000 to hit our online fundraising budget in these next few months, so please read more from Monika and pitch in if you can.

payment methods

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate