Air quality improvements throughout the Potomac River watershed—due primarily to the Clean Air Act—have helped improve water quality in the Chesapeake Bay, according to research from the University of Maryland Center for Environmental Science (UMCES).
When cars, power plants and other sources emit air pollution, it can be carried by wind and weather over long distances until it falls onto land or directly into the water. In fact, scientists estimate that one third of the nitrogen in the Chesapeake Bay comes from the air—through a process known as atmospheric deposition. And while studying water quality trends in the Upper Potomac River Basin, UMCES scientists confirmed that reductions in atmospheric nitrogen deposition are playing a large role in improvements in the area’s water quality.
“Most best management practices—like a riparian buffer or retention pond—only impact a relatively small area,” said Keith Eshleman, professor at UMCES’ Appalachian Laboratory and co-author of the study. “You can think about the Clean Air Act as a best management practice that affects every square meter of the watershed.”
Experts at the Chesapeake Bay Program will be able to incorporate the findings into their modeling efforts, in order to better simulate the benefits of the Clean Air Act on reducing nitrogen pollution. The study—along with other research, monitoring and data collected over the past decade—will support Bay Program decision-making during the upcoming Midpoint Assessment of the Chesapeake Bay Total Maximum Daily Load, or TMDL.
Last year, the Chesapeake Bay Program released an interactive story map illustrating how Clean Air Act regulations, as well as decades of enforcement actions, led to a steady decline in air pollution across the Chesapeake Bay watershed.
The study—“Declining nitrate-N yields in the Upper Potomac River Basin: What is really driving progress under the Chesapeake Bay restoration?”—can be found online.
Many residents of the region know that pollutants in rivers like the James, Potomac and Susquehanna can end up in the Chesapeake Bay. In fact, the Chesapeake Bay watershed—or the area of land over which water flows into the nation’s largest estuary—stretches from Cooperstown, New York, to Norfolk, Virginia. Less well known is the fact that the Bay’s so-called “airshed” extends much farther: particles of air pollution emitted as far away as Cincinnati, Ohio, can reach the waters of the Bay.
At 570,000 square miles, the Bay’s airshed is nine times as large as its watershed. Because pollution emitted into the air can be carried over long distances by wind and weather, it should come as no surprise that emissions associated with hydraulic fracturing operations in Pennsylvania and West Virginia have been found in Baltimore, Maryland, and Washington, D.C., or that emissions from gas, coal and oil-powered machines in Tennessee or North Carolina can lead to algae blooms in the waters of Maryland and Virginia.
Scientists estimate that one-third of the total nitrogen that pollutes the Bay comes from the air, often in the form of nitrogen oxides generated by power plants or machines. Through a process known as atmospheric deposition, six to eight percent of this airborne nitrogen falls onto the water directly, sometimes as dry particles and sometimes attached to raindrops, snowflakes or sleet. The rest falls onto the land, where it soaks into groundwater or washes into rivers and streams. Once in the water, nitrogen can fuel the growth of harmful algae blooms that create low-oxygen dead zones that suffocate marine life.
But there is evidence that regulations meant to curb air pollution are having a positive impact on our air and our water. In 2014, for instance, researchers with the University of Maryland Center for Environmental Science traced a drop in the amount of nitrogen found in some Maryland, Pennsylvania and Virginia waterways to the Clean Air Act. In 2015, the U.S. Environmental Protection Agency declared the drop in the atmospheric deposition of nitrogen observed in the region over the past two decades can also be attributed to the Clean Air Act. And in 2016, our own water quality modeling experts confirmed we are still seeing benefits of the Clean Air Act emerge as estimates of the atmospheric deposition of nitrogen continue to fall.
This means efforts to curb air pollution across the nation have curbed water pollution in our watershed. In 1985, an estimated 52.2 million pounds of nitrogen fell directly onto the region’s waters. Thirty years later, this number has dropped to 17.88 million pounds, and data show that pollution-reducing practices put in place between 2009 and 2015 in an effort to meet the Bay’s “pollution diet” have reduced the atmospheric deposition of nitrogen 20 percent.
Today, the Chesapeake Bay Program unveiled a new, interactive story map—titled “Cleaner Air, Cleaner Bay”—showing how Clean Air Act regulations, as well as decades of enforcement actions, have led to a steady decline in air pollution across the Chesapeake region.
Polluted air can have quite an impact on the health of local waters: scientists estimate that one third of the nitrogen in the Bay comes from the air through a process known as atmospheric deposition. When our cars, power plants or other sources emit air pollution, it can be carried by wind and weather over long distances until it falls onto land or directly into the water.
Even pollution emitted thousands of miles away can eventually end up in our waterways. While the area of land that drains into the Bay spans six states and 64,000 square miles, the Bay’s “airshed”—the area of land over which airborne pollutants travel to enter the estuary—is nine times that size. Nearly three-quarters of the airborne nitrogen that eventually ends up in the Bay is generated by sources within this airshed, and the remaining 25 percent is emitted from sources even farther away. Which is why policies like the Clean Air Act have been essential in reducing the amount of pollution that reaches the Bay.
“We don’t often think about air as a source of pollution to Chesapeake Bay waters,” said Bay Program Director Nick DiPasquale. “The good news, as illustrated by this story map, is that we have been very successful in reducing airborne emissions through Clean Air Act regulations that have improved water quality in the Bay region.”
Excess nitrogen can fuel the growth of harmful algae blooms that block sunlight from reaching underwater grasses and create low-oxygen “dead zones” that suffocate marine life. In addition to national and local regulatory actions, pollution-reducing practices in backyards, in cities and on farms play a critical role in decreasing the flow of nitrogen.
Learn more about air pollution in the Bay region.
Faith plays an influential role in the lives of billions of people in the world, with about 84 percent identifying with a religious group. As Ramadan, a month-long ritual focused on self-purification and refocusing attention to faith, comes to an end for roughly 1.6 billion Muslims around the world, it is a good time to reflect on the intersection between conviction and nature.
Green Muslims, a Washington, D.C., based organization with the mission of helping their community live in the environmental spirit of Islam, began with a conversation between a group of friends about how to ‘green’ their Ramadan. At first they took small measures, like switching to reusable plates and having zero-trash iftars, or evening meals, when they could break their fasts. Those simple actions set off a chain reaction of stewardship within the community that led to the formal establishment of Green Muslims as a volunteer organization in 2007.
The nonprofit works with a number of different Muslim communities in the D.C. area, but serves as a national resource for those across the country that are looking to tie their faith back to the natural world. “There is really a passion and a yearning for learning more about what our tradition is amongst the Muslim community everywhere, and we hope to provide those resources and incubate that energy to take it to the next level,” said Colin Christopher, Executive Director of Green Muslims.
With many youths spending an increasing amount of time indoors, exposure to and connections with the natural world are lost, often times leading to rises in health problems like allergies and obesity. In a push to alleviate nature deficit disorder, Green Muslims launched the ‘Our Deen is Green’ Youth Outdoor Education Program this year. The program offers a wide range of field trips to places like the Chesapeake Bay, farms and conserved lands to demonstrate real life examples of how Islam and the environment are intertwined.
Each trip offers themed lessons that cover subjects such as, water, food waste and renewable energy. The goal of the program is to reconnect the participants with outdoor spaces and encourage healthy behavior changes, like wiser food choices and increased awareness about human impacts on the planet. “In Islam, we understand that God has an amount of trust in us as Khalifas, or stewards of the Earth. We really see our responsibility as people who need to conserve and protect the natural environment; we are called to do so, it’s our responsibility,” said Christopher.
The final trip of the year was to Rock Creek Park in Washington, D.C., where the kids toured the historic Peirce Mill and learned how the Earth’s natural processes like water flow and wind create energy that can be harnessed with minimal negative impacts to the environment. Prior to touring the mill, all eight kids sat contently in a circle making windmills out of paper and pencils while discussing where their energy comes from. “Why are we always talking about water?” asks a young boy. “Because we are made of water,” replies Christopher. A look of awe falls over the children’s faces. The importance of water is a theme that weaves through all lessons taught during the program.
The Qur’an has hundreds of verses that talk about water, animals, wind and the sun, and Sharia, or Islamic law, directly translates into ‘the pathway to the water source’—meaning that protecting water is of utmost importance in the tradition of Islam. “Every part of our natural environment is integral to the greater whole. In Islam, we talk about, if you have one limb that is unhealthy then the entire body is unhealthy and sick. So, the Chesapeake Bay is a really integral part of that entire ecosystem and we can’t afford to neglect the Bay or other parts of our ecosystem," explained Christopher.
Although the organization aims to spread awareness about the link between Islam and the environment, Christopher believes that diversity is the backbone of the Muslim community and welcomes anyone, regardless of faith, to volunteer and participate in Green Muslim events. “I think that the challenges we face relate to education. There is a lot of misinformation about Islam and what Islam is,” noted Christopher. “We are trying to bring back the teachings of our traditions within our community and explain that conservation, moderation and love for creation are core components of our tradition.”
To view more photos, visit the Chesapeake Bay Program’s Flickr page.
Images by Will Parson
Text by Jenna Valente
When too much nitrogen enters the Chesapeake Bay, it can fuel the growth of harmful algae blooms that block sunlight from reaching underwater grasses and create low-oxygen areas, or “dead zones,” that suffocate marine life. But some key successes in curbing the amount of nitrogen entering local waterways have a potentially surprising source—the Clean Air Act.
In a factsheet released last week, the U.S. Environmental Protection Agency (EPA) outlines how declines in air pollution have substantially reduced the amount of airborne nitrogen that ends up in the Bay, helping the agency and its partners stay on track to meet the water quality goals of the Total Maximum Daily Load (TMDL), or “pollution diet,” which representatives from across the Bay region recommitted to achieving as part of the Chesapeake Bay Watershed Agreement.
Polluted air can have quite an impact on the health of local waters: scientists estimate that one third of the nitrogen in the Bay comes from the air through a process known as atmospheric deposition. When our cars, power plants or other sources emit air pollution, it can be carried by wind and weather over long distances until it falls onto land or into the water.
“Atmospheric deposition falls everywhere on the Chesapeake watershed, from forests, to fields, to parking lots,” said Lewis Linker, modeling coordinator with the Chesapeake Bay Program. “When this load of nitrogen is reduced, it improves water quality everywhere from stormwater runoff, to small headwater streams, …to the Chesapeake Bay.”
Even pollution emitted thousands of miles away can eventually end up in our waterways. While the area of land that drains into the Bay spans six states and 64,000 square miles, the Bay’s “airshed”—the area of land over which airborne pollutants travel to enter the estuary—is nine times that size. Nearly three-quarters of the airborne nitrogen that eventually ends up in the Bay is generated by sources within this airshed, and the remaining 25 percent is emitted from sources even farther away. Which is why, says Linker, national policies like the Clean Air Act are essential in reducing the amount of pollution that reaches the Bay.
“To restore the Chesapeake, the citizens of the Chesapeake watershed have done a lot of bootstrapped cleanup in their own backyards and watersheds,” said Linker. “But when it comes to atmospheric deposition of nitrogen, the reduction can’t be done by the Chesapeake state partners alone—it’s a job for the whole nation.”
For more on what you can do to curb air pollution, Take Action.
Learn more about the EPA’s efforts to curb nitrogen deposition in the Chesapeake.
The nation’s forests save more than 850 lives each year, according to a new report from the U.S. Forest Service.
Image courtesy craigcloutier/Flickr
In a study that will be published in the October issue of Environmental Pollution, scientists with the U.S. Forest Service have determined the magnitude and economic value of the effects trees have on air quality and human health. While we have long known that trees remove pollutants from the air, this study shows that in 2010, trees in the conterminous United States removed 17.4 million tons of pollution, with a human health value of $6.8 billion.
In addition to saving more than 850 lives, these trees reduced more than 670,000 incidences of acute respiratory symptoms and 430,000 incidences of asthma exacerbation. Trees also saved 200,000 lost days of school.
Image courtesy pavlinajane/Flickr
A forest’s pollution removal rates can be affected by pollution concentrations, tree cover, weather conditions, length of growing season and other environmental stressors. In general, scientists found that while trees’ pollution removal was greater in rural areas, the economic value of this pollution removal was greater in urban areas. In other words, because of their proximity to people, trees in urban areas have a greater impact on human health.
“More than 80 percent of Americans live in urban areas containing over 100 million acres of trees and forests,” said Michael T. Rains, director of the Forest Service’s Northern Research Station in a media release. “This research clearly illustrates that America’s urban forests are critical capital investments [that are] helping produce clean air and water [and] reduce energy costs and making cities more livable. Simply put, our urban forests improve people’s lives.”
The Chesapeake Bay Program has set a goal to expand urban tree canopy by 2,400 acres by 2025. Indeed, trees can improve air quality, water quality and habitat in ways not discussed in this study. Trees near buildings, for instance, lower energy use. Trees along rivers and streams reduce the amount of nutrients entering local waterways. And trees provide food, shelter, nesting sites and safe migration paths for critters in the water and on land.
“Urban tree planting is part of the Watershed Improvement Plan for six Bay jurisdictions,” said U.S. Forest Service Chesapeake Liaison Sally Claggett. “To reach water quality goals, these jurisdictions are targeting nearly 20,000 acres of new tree canopy by 2025—so the goal of 2,400 acres may be reached early. Partners are planning an Urban Forestry Summit in fall 2014 to help make that happen.”
Solar energy is on the rise in the United States, and one jurisdiction in the Chesapeake Bay watershed has been named a leader in the solar energy revolution.
Image courtesy Mountain/\Ash/Flickr
According to a report released by Environment America, Delaware is one of the ten states that have installed the greatest amount of solar energy capacity per capita. At 82 watts per person, the state is in seventh place.
Since December 2008, Delaware has expanded its solar capacity from 2 to 59 megawatts. According to the Department of Natural Resources and Environmental Control (DNREC), the state has installed 1,600 solar energy systems on government buildings, businesses, schools and homes. What's driving this effort? Legislation, policies and financial incentives that support going solar.
Image courtesy Pacific Northwest National Library/Flickr
Solar energy uses the sun as fuel to create heat or electricity. It’s considered cleaner than coal- or natural gas-fired power plants because it doesn’t burn fossil fuels, which can release emissions that contribute to climate change.
Like other states in Environment America’s top ten, Delaware’s interconnection policies make it easier for individuals and companies to connect their solar energy systems to the power grid. Solar rebates and other financing options help lower the cost of installation, while "net metering" policies compensate consumers for the excess energy they return. The solar market is also moving forward in response to Delaware’s Renewable Portfolio Standard, which calls for the state to draw 25 percent of its power from renewable sources by 2025, with at least 3.5 percent coming from solar.
“Encouraging solar power is the right thing to do for the environment and our economy,” said Delaware Gov. Jack Markell in a media release. “We are aggressively working toward a clean energy future in Delaware, demonstrating we can have both a strong economy and a healthy environment. That means creating a robust market for solar and other clean energy systems, creating clean energy jobs, expanding our solar industry and improving air quality.”
Two additional watershed jurisdictions received special mention in Environment America’s report: New York, whose solar energy market is growing quickly, and the District of Columbia, where new clean energy policies are set to make solar more attractive and accessible to consumers.
The U.S. Environmental Protection Agency (EPA) released its proposed Clean Power Plan this week, which EPA Administrator Gina McCarthy called a “vital piece” of President Obama’s plan to cut carbon pollution and slow the effects of climate change.
Image courtesy Rennett Stowe/Flickr
The Clean Power Plan aims to lower carbon emissions from the power sector to 30 percent below 2005 levels. According to the EPA, this would also cut emissions of particle pollution, nitrogen oxides and sulfur dioxide more than 25 percent, lowering asthma attacks and medical bills and working toward justice for the low-income communities that are hardest hit by air pollution.
Fossil-fueled power plants are the largest source of carbon pollution in the United States, accounting for one-third of our greenhouse gas emissions. Left unchecked, carbon pollution leads to rising temperatures and sea levels and changes in weather patterns, ecosystems and habitats. It also worsens smog, which affects the heart and lung health of children, older adults and people living in poverty.
“This is about protecting our health and our homes,” McCarthy said in a speech celebrating the plan’s release.
Image courtesy francescopratese/Flickr
The plan would give states the freedom to chart their own course toward their own goals. “There is no one-size-fits-all solution,” McCarthy said. Instead, states can “mix and match” methods of electricity production—whether it is a low-carbon or “no” carbon source like nuclear, wind or solar energy—and pollution control policies to ensure a “smooth transition to cleaner power.”
Comments on the proposal will be accepted for 120 days after its publication in the Federal Register. The EPA will host public hearings on the plan in Denver, Atlanta, the District of Columbia and Pittsburgh during the week of July 28, and will finalize the plan next June.
Pollution-reducing practices can improve water quality in the Chesapeake Bay and have already improved the health of local rivers and streams, according to new research from the Chesapeake Bay Program partnership.
In a report released today, several case studies from across the watershed show that so-called “best management practices”—including upgrading wastewater treatment technologies, lowering vehicle and power plant emissions, and reducing runoff from farmland—have lowered nutrients and sediment in local waterways. In other words, the environmental practices supported under the Clean Water Act, the Clean Air Act and the Farm Bill are working.
Excess nutrients and sediment have long impaired local water quality: nitrogen and phosphorous can fuel the growth of algae blooms and lead to low-oxygen “dead zones” that suffocate marine life, while sediment can block sunlight from reaching underwater grasses and suffocate shellfish. Best management practices used in backyards, in cities and on farms can lower the flow of these pollutants into waterways.
Data collected and analyzed by the Bay Program, the University of Maryland Center for Environmental Science (UMCES) and the U.S. Geological Survey (USGS) have traced a number of local improvements in air, land and water to best management practices: a drop in power plant emissions across the mid-Atlantic has led to improvements in nine Appalachian watersheds, upgrades to the District of Columbia's Blue Plains Wastewater Treatment Plant have lowered the discharge of nutrients into the Potomac River and planting cover crops on Eastern Shore farms has lowered the amount of nutrients leaching into the earth and reduced nitrate concentrations in groundwater.
“In New Insights, we find the scientific evidence to support what we’ve said before: we are rebuilding nature’s resilience back into the Chesapeake Bay ecosystem, and the watershed can and will recover when our communities support clean local waters,” said Bay Program Director Nick DiPasquale in a media release.
But scientists have also noted that while we have improved water quality, our progress can be overwhelmed by intensified agriculture and unsustainable development, and our patience can be tested by the “lag-times” that delay the full benefits of restoration work.
“This report shows that long-term efforts to reduce pollution are working, but we need to remain patient and diligent in making sure we are putting the right practices in place at the right locations in Chesapeake Bay watershed,” said UMCES President Donald Boesch in a media release. “Science has and will continue to play a critical role informing us about what is working and what still needs to be done.”
UMCES Vice President for Science Applications Bill Dennison echoed Boesch’s support for patience and persistence, but added a third P to the list: perspiration. “We’ve got to do more to maintain the health of this magnificent Chesapeake Bay,” he said.
“We’ve learned that we can fix the Bay,” Dennison continued. “We can see this progress… and it’s not going to be hopeless. In fact, it’s quite hopeful. This report makes a good case for optimism about the Chesapeake Bay.”
The reduction of power plant emissions in the mid-Atlantic has improved water quality in the Chesapeake region, according to new research from the University of Maryland Center for Environmental Science (UMCES).
Image courtesy haglundc/Flickr
Researchers at the university’s Appalachian Laboratory have traced improvements in the water quality trends of nine forested watersheds located along the spine of the Appalachian Mountains to the Clean Air Act’s Acid Rain Program. Passed in 1990, the Acid Rain Program led to a 32 percent drop in human-caused nitrogen-oxide emissions in 20 states. As these emissions have declined, so too has the amount of nitrogen found in some Pennsylvania, Maryland and Virginia waterways.
In other words, while the Acid Rain Program only intended to reduce the air pollution that causes acid rain, it had the unintended consequence of reducing the amount of nitrogen oxide particles landing on the region’s forests, thus improving local water quality.
“Improvements in air quality provided benefits to water quality that we were not counting on,” said UMCES President Donald Boesch in a media release.
Once nitrogen oxide particles are emitted into the air, wind and weather can carry them long distances. In time, these particles fall onto the land or into the water. Nitrogen that enters rivers and streams can fuel the growth of algae blooms, which block sunlight from reaching underwater grasses and create low-oxygen “dead zones” that suffocate marine life. Scientists estimate that just over one-third of the nitrogen polluting the Bay comes from the air.