Gas flares tied to premature deaths
Effect of black carbon particles on health

Date:
February 28, 2022
Source:
Rice University
Summary:
Engineers suggest that flaring of natural gas at oil and gas
fields in the United States, primarily in North Dakota and Texas,
contributed to dozens of premature deaths in 2019.



FULL STORY ========================================================================== Newly published research by Rice University environmental engineers
suggests flaring of natural gas from oil and gas fields in the United
States, primarily in North Dakota and Texas, contributed to dozens of
premature deaths in 2019.


========================================================================== Satellite observations and computer models can link gas flares to air
pollution and health, according to Daniel Cohan of Rice's George R. Brown School of Engineering and his colleagues, who published their findings
in the journal Atmosphere.

Oil and gas producers flare excess gas when infrastructure to bring it to market is unavailable. While flaring reduces the direct venting of the
powerful greenhouse gas methane into the atmosphere, it also produces
black carbon particles, also known as soot or particulate matter. These particles, smaller than 2.5 microns in diameter, can impair lung function
and cause respiratory disease, heart disease and strokes.

The Rice team partnered with researchers from the Clean Air Task Force
to produce calculations, based on infrared satellite observations of oil
fields where 97% of flaring takes place, showing that the United States
emitted nearly 16,000 tons of black carbon in 2019. The researchers used computationally efficient reduced-form models to estimate that 26-53
premature deaths were directly attributable to air quality associated
with flares.

"Our research shows that flaring not only wastes a valuable fuel
but is deadly, too," said Cohan, an associate professor of civil and environmental engineering, who led the study with first-year graduate
student Chen Chen.

"Particulate matter causes more deaths than all other air pollutants
combined, and flares are an important source of it." Flares aren't the
only source of particulate matter in the atmosphere.

Particles are also produced whenever fossil fuels are burned, including
by vehicles, and by wildfires, cooking meat and other sources.

The researchers' models accounted for the fact that the heat content
of the burning fuel varies widely across oil and gas fields and has a
strong impact on black carbon emissions.

"For this study, we used 10 different emission factors for flares,
and using the reduced-form models made the calculations super-fast,"
Chen said. "Other studies show a good relationship between full and reduced-form models, so we're confident in our results." Cohan said
black carbon emissions also contribute to climate change by absorbing
solar radiation in the atmosphere, influencing the formation of clouds
and accelerating snow and ice melt, though all of those consequences
were beyond the scope of their study.

The researchers noted there are cost-effective technological alternatives
to flaring, including gas-gathering pipelines, small-scale gas utilization
and reinjecting excess back into the ground. While the Environmental
Protection Agency (EPA) is considering regulations to reduce both methane emissions and associated gas flaring, there are currently no federal
limits to the widespread practice of flaring, they wrote.

"We initially didn't think about publishing a peer-reviewed paper,"
Chen said.

"We were asked by the Clean Air Task Force to estimate these health
impacts to support their advocacy to reduce harmful pollution from oil
and gas production.

But because the clearly shows dozens of deaths per year due to flaring,
we thought a paper would provide regulators with new angles to consider
in their efforts to minimize the impacts of oil and gas air pollution." Co-authors are senior scientist David McCabe and senior analyst Lesley Fleischman of the Clean Air Task Force.

========================================================================== Story Source: Materials provided by Rice_University. Note: Content may
be edited for style and length.


========================================================================== Journal Reference:
1. Chen Chen, David C. McCabe, Lesley E. Fleischman, Daniel
S. Cohan. Black
Carbon Emissions and Associated Health Impacts of Gas Flaring
in the United States. Atmosphere, 2022; 13 (3): 385 DOI:
10.3390/atmos13030385 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/02/220228103818.htm

--- up 10 hours, 50 minutes
* Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (1:317/3)