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Wednesday, July 28, 2021

As the smoke of wildfire spreads, who is at risk?

Billings, Mont. Smoke from wildfires in the western US and Canada is covering most of the continent, including the continent thousands of miles away on the east coast. And experts say the phenomenon is becoming more common as human-caused global warming stokes larger and more intense blazes.

Smoke pollution reached unhealthy levels this week in communities from Washington state to Washington DC

Get used to it, researchers say.

“This fire is going to burn all summer,” said Dan Jaffe, a wildfire smoke expert at the University of Washington. “In terms of poor air quality, everywhere in the country this year is going to be worse than average.”

Growing scientific research points to potential long-term health damage from breathing in fine particles of smoke. Authorities have scrambled to better protect people from harmful effects, but face challenges in communicating the risk to vulnerable communities and people living far away from burning forests.

Why is there so much smoke and how dangerous is it?

Decades of aggressive fires allowed a build-up of dead trees and other fuel in the forests. Now climate change is drying up the landscape, making it easier for fires to ignite and spread as more people move to areas affected by fires.

The number of unhealthy air quality days recorded in 2021 by pollution monitors nationwide has more than doubled in each of the past two years, according to data provided by the Environmental Protection Agency to the Associated Press. Officials said the likelihood of forest fires is increasing very high.

The amount of smoky wildfires is directly related to how much land it burns – stemming from more than 4,100 square miles (10,600 square kilometers) in the US and 4,800 square miles (12,500 square kilometers) in Canada so far in 2021. That’s behind the 10-year average for this time of year for both countries, but forecasters warn the situation could worsen as 85 percent of the West is facing severe drought.

There are hundreds of chemical compounds in wildfire smoke, and many can be harmful in large amounts. Health officials use the concentration of smoke particles in the air to assess the severity of a threat to the public.

In the years of bad fires over the past decade, hellfires across the West emit more than a million tons of particulates annually, according to US Forest Service research.

Scientists link smoking exposure to long-term health problems, including decreased lung function, a weakened immune system, and higher rates of the flu. In the short term, vulnerable people can be hospitalized and sometimes die from excessive smoke, according to physicians and public health officials.

When communities burn, the smoke can be especially dangerous. A 2018 fire in Paradise, California killed 85 people and engulfed 14,000 homes, leaving northern California in a thick layer for weeks. Smoke from burning homes and buildings contains more toxic plastics and other manufactured materials as well as chemicals stored in garages.

where are the fires?

About 80 major wildfires are now burning across the US, including 19 in Montana. The largest – the bootleg fire of eastern Oregon – has grown to 618 square miles. It is half the size of Rhode Island, yet fewer than 200 homes and other structures have been confirmed to have been destroyed as fires continue to burn in a sparsely populated area.

According to Canadian officials, more than 200 fires are burning in Manitoba and Ontario.

Weather patterns and fire intensity determine who gets exposed to smoke. Fierce fires generate so much heat that they can create their own clouds that funnel smoke high into the atmosphere.

“It just spreads across the country and slowly spreads, creating a layer of haze in the sky,” said Miles Bliss, a meteorologist with the National Weather Service in Medford, Oregon.

Air pollution data shows the combined plume of Canada and the US passed through parts of the Midwest this week before settling at ground level in an area stretching from Ohio northeast to New England and the Carolinas in the south .

The effects on health can be thousands of miles away from the flames. Jeff Pearce, an atmospheric scientist at Colorado State University, said the smoke loses its foul smell, but remains a potential hazard, even if it goes so far.

Nation World News Deskhttps://nationworldnews.com
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