Coal pollution more deadly than other fossil particles – study

A new study has found air pollution particles from coal-fired power plants are more harmful to human health than many experts realized.

As the build up to the COP28 climate summit continues the study led by Lucas Henneman, Assistant Professor of Engineering, George Mason University found  it is such particles are more than twice as likely to contribute to premature deaths as air pollution particles from other sources.

In the study Henneman and colleagues mapped how U.S. coal power plant emissions travelled through the atmosphere, then linked each power plant’s emissions with death records of Americans over 65 years old on Medicare.

“Our results suggest that air pollutants released from coal power plants were associated with nearly half a million premature deaths of elderly Americans from 1999 to 2020,” he explained. “It’s a staggering number, but the study also has good news: Annual deaths associated with US coal power plants have fallen sharply since the mid-2000s as federal regulations compelled operators to install emissions scrubbers and many utilities shut down coal plants entirely.”

The study found in 1999, 55,000 deaths were attributable to coal air pollution in the US. By 2020, that number had fallen to 1,600.

“In the U.S., coal is being displaced by natural gas and renewable energy for generating electricity. Globally, however, coal use is projected to increase in coming years. That makes our results all the more urgent for global decision-makers to understand as they develop future policies,” added Henneman in an article from the Conversation.

A landmark study in the 1990s, known as the Harvard Six Cities Study, linked tiny airborne particles called PM2.5 to increased risk of early death. Other studies have since linked PM2.5 to lung and heart disease, cancer, dementia and other diseases.

Following that research, the Environmental Protection Agency began regulating PM2.5 concentrations in 1997 and has lowered the acceptable limit over time.

PM2.5 – particles small enough to be inhaled deep into the lungs – comes from several different sources, including gasoline combustion in vehicles and smoke from wood fires and power plants. It is made up of many different chemicals.

“Coal is also a mix of many chemicals – carbon, hydrogen, sulphur, even metals,” Henneman explained. “When coal is burned, all of these chemicals are emitted to the atmosphere either as gases or particles. Once there, they are transported by the wind and interact with other chemicals already in the atmosphere.

“As a result, anyone downwind of a coal plant may be breathing a complex cocktail of chemicals, each with its own potential effects on human health.”

To understand the risks coal emissions pose to human health, researchers tracked how sulphur dioxide emissions from each of the 480 largest US coal power plants operating at any point since 1999 travelled with the wind and turned into tiny particles – coal PM2.5

“In our statistical model, we controlled for other pollution sources and accounted for many other known risk factors, like smoking status, local meteorology and income level,” said Henneman. “We tested multiple statistical approaches that all yielded consistent results. We compared the results of our statistical model with previous results testing the health impacts of PM2.5 from other sources and found that PM2.5 from coal is twice as harmful as PM2.5 from all other sources.

“The number of deaths associated with individual power plants depended on multiple factors – how much the plant emits, which way the wind blows and how many people breathe in the pollution. Unfortunately, U.S. utilities located many of their plants upwind of major population centres on the East Coast. This siting amplified these plants’ impacts.”

Henneman  said the US has been taking action to cuit coal pollution.

“Engineers have been designing effective scrubbers and other pollution-control devices that can reduce pollution from coal-fired power plants for several years. And the EPA has rules specifically to encourage utilities that used coal to install them, and most facilities that did not install scrubbers have shut down.,” he explained. The results have been dramatic: Sulphur dioxide emissions decreased about 90% in facilities that reported installing scrubbers. Nationwide, sulphur dioxide emissions decreased 95% since 1999. According to our tally, deaths attributable to each facility that installed a scrubber or shut down decreased drastically.

“As advances in fracking techniques reduced the cost of natural gas, and regulations made running coal plants more expensive, utilities began replacing coal with natural gas plants and renewable energy. The shift to natural gas – a cleaner-burning fossil fuel than coal but still a greenhouse gas contributing to climate change – led to even further air pollution reductions.

“Today, coal contributes about 27% of electricity in the U.S., down from 56% in 1999.”

Globally, however,  the team said the outlook for coal is mixed. While the US and other nations are headed toward a future with substantially less coal, the International Energy Agency expects global coal use to increase through at least 2025.

“Our study and others like it make clear that increases in coal use will harm human health and the climate.,” Henneman concluded. “Making full use of emissions controls and a turn toward renewables are surefire ways to reduce coal’s negative impacts.”