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Yellowstone National Park, America's first national park, is located in Wyoming, Montana, and Idaho. The park is downwind of significant pollutant sources, including power plants, agricultural areas, industry, and oil and gas development. In the 1990s and early 2000s, elevated levels of carbon monoxide, fine particulate matter, and hydrocarbons were recorded in high-traffic areas, creating health risks for visitors and employees. Air pollution can harm the park's natural resources and ecosystems, and sensitive groups may experience symptoms such as difficulty breathing or throat irritation. Real-time air pollution data is available for West Yellowstone Park in Montana, and efforts to manage over-snow vehicle use have effectively improved air quality in the park.
| Characteristics | Values |
|---|---|
| Air Pollutants | Carbon monoxide (CO), fine particulate matter (2.5 micrometers), hydrocarbons, nitrogen (N) and sulfur (S) compounds, ammonium, nitrate, and sulfate |
| Sources of Air Pollution | Power plants, agricultural areas, industry, oil and gas development, over-snow vehicles, and wildfires |
| Effects of Air Pollution | Harm to natural and scenic resources such as surface waters, vegetation, and visibility; potential health risks for visitors and park employees |
| Air Quality Index (AQI) | Values vary but generally considered "good" or "acceptable" |
| PM2.5 Concentration | 1.1 times the World Health Organization's annual guideline value |
| Sensitive Groups | May experience symptoms such as difficulty breathing or throat irritation due to air pollution |
| Lichen Communities | Impacted by air pollution, with a decline in species richness and abundance |
| Forest Cover | Forested area makes up 3481 km2 (39.1%) of the land area of Yellowstone National Park |
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What You'll Learn
Air pollution sources
Yellowstone National Park, located in Wyoming, Montana, and Idaho, is home to the famous Old Faithful geyser. The park's air quality is impacted by several sources of air pollution, both from within and outside the park. Here are the key air pollution sources affecting Yellowstone:
External Sources:
- Power plants: Yellowstone National Park is downwind of power plants, which are significant contributors to air pollution.
- Agricultural areas: Pollution from nearby agricultural activities can reach the park.
- Industry: Industrial activities in the region can release pollutants into the air, affecting the park's air quality.
- Oil and gas development: Emissions from oil and gas operations can impact the park's air quality.
Internal Sources:
- Over-snow vehicles: In the past, the use of over-snow vehicles, such as snowmobiles, has been linked to increased levels of carbon monoxide (CO), fine particulate matter, and hydrocarbons within the park. These pollutants can create health risks for visitors and employees. However, effective management of over-snow vehicle use has helped reduce pollution levels.
- Wildfires: Wildfires in and around the park can contribute to air pollution, releasing particulate matter and other harmful substances into the atmosphere.
It's important to note that air pollution can have detrimental effects on the park's natural resources, including surface waters, vegetation, and visibility. Additionally, nitrogen (N) and sulfur (S) compounds deposited from the air can negatively impact the sensitive lichen communities in the park, leading to ecological imbalances.
To address these issues, the National Park Service works to mitigate the effects of air pollution through scientific research, policy implementation, and planning. Their efforts aim to protect the park's natural environment and the health of visitors and staff.
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Impact on lichens
Lichens are very sensitive to changes in air pollution and can be used as indicators of air quality. They absorb nutrients directly from the air and do not have a protective surface, so anything in the air is taken straight inside. If there are pollutants, they can quickly accumulate in the lichen and become toxic. As such, the presence and health of lichens can indicate the level of pollution in the environment. The smaller the lichens and the less variety of lichens in an area, the more polluted the environment.
Yellowstone National Park is downwind of significant pollutant sources, including power plants, agricultural areas, industry, and oil and gas development. Air pollution from these sources can harm the park's natural and scenic resources, including vegetation. Two common and abundant species of epiphytic lichen, Bryoria fremontii and Letharia vulpina, were collected and analyzed in the park in 1998. Studies have also confirmed that lichens absorb gaseous elemental mercury, which is emitted by the park's geothermal features, fairly easily. Mercury concentrations in lichens have been used to estimate atmospheric mercury concentrations, although this method has its limitations due to the complex biological processes involved.
Nitrogen and sulfur compounds deposited from the air can have harmful effects on ecosystems, and nitrogen dioxide is particularly harmful to human health. The critical load for nitrogen to protect lichen species richness was exceeded in 73% of the forested area of the park, which covers 39.1% of its land area. This indicates a high risk of negative impacts on lichens in the park.
To preserve lichens and the ecosystems they are a part of, it is important to address and reduce air pollution levels. Efforts to manage over-snow vehicle use and emissions from power plants and other sources have been effective in improving air quality in Yellowstone National Park.
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Health risks
Yellowstone National Park, located in Wyoming, Montana, and Idaho, is downwind of significant pollutant sources, including power plants, agricultural areas, industry, and oil and gas development. These pollutants have various health risks for both the park's visitors and wildlife.
In the 1990s and early 2000s, elevated levels of carbon monoxide (CO), fine particulate matter (2.5 micrometers), and hydrocarbons were recorded in high-traffic areas, creating health risks. These pollutants can have adverse effects on human health, causing respiratory issues and contributing to cardiovascular problems. Additionally, the presence of contaminants in snow, such as ammonium, nitrate, and sulfate, has been linked to increased snowmobile use, posing risks to those engaging in winter activities.
Airborne toxins, including mercury, pesticides, and microplastics, have been detected in the park's air, water, and wildlife. Mercury, a potent neurotoxin, can accumulate in fish and birds, leading to reduced reproductive success, impaired growth, and decreased survival rates. Ingestion of contaminated fish can also pose risks to human health, as mercury can impact the nervous system and developmental processes. Microplastics, found in water, fish, and insects, can enter the food chain, potentially leading to health complications for both wildlife and humans.
Nitrogen (N) and sulfur (S) compounds deposited from the air can negatively impact the park's ecosystems. While healthy ecosystems can tolerate a certain level of pollution, excessive N and S deposition can lead to eutrophication and acidification. Eutrophication increases soil and water nutrients, causing certain species to grow more rapidly and altering the community composition. Acidification, on the other hand, leaches important cations from soils and water bodies, reducing habitat quality and potentially affecting the health of both wildlife and humans who depend on these ecosystems.
Ground-level ozone, formed from the reaction of nitrogen oxides and volatile organic compounds in the presence of sunlight, poses risks to both human health and the environment. It can damage plant tissues, making it difficult for plants to produce and store food, and weakening their defence mechanisms against diseases and insect infestations.
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Air quality data
Real-time air quality data for Yellowstone National Park is available from AccuWeather, which sources its data from Plume Labs. The data includes current index, forecast, daily, and hourly measurements. AccuWeather presents the information for public benefit and advises users to refer to Plume Labs' General Terms and Conditions for data accuracy and legal liability. The Air Quality Index (AQI) is calculated using standards and guidelines developed by the Environmental Protection Agency (EPA) and the World Health Organization (WHO), among other scientific studies.
The World Air Quality Index project provides real-time air pollution data for West Yellowstone Park in Montana, with a Chrome extension available for download. This data is unvalidated and may be amended without notice. IQAir also provides an air quality index for Yellowstone National Park, with a current PM2.5 concentration of 1.1 times the World Health Organization's annual guideline value.
Yellowstone's ecosystem is particularly sensitive to nitrogen (N) and sulfur (S) compounds deposited from the air, which can have harmful effects on ecosystem processes. Epiphytic lichen communities, which are sensitive to changes in air pollution, are impacted by N and S deposition through eutrophication and acidification.
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Pollution reduction efforts
Yellowstone National Park, America's first national park, is located in Wyoming, Montana, and Idaho. The park is downwind of significant sources of air pollution, including power plants, agricultural areas, industry, and oil and gas development. Even emissions from over-snow vehicles like snowmobiles affect the park's winter air quality. To address these issues, the National Park Service has implemented various measures to reduce pollution and protect the park's natural resources.
One successful strategy has been the management of over-snow vehicle use. By lowering the number of vehicles allowed, requiring the use of the best available technology to reduce emissions, and modifying entrance station procedures to disperse vehicles, the park has effectively reduced air pollutant levels. These changes have improved the air quality within the park and protected the health of visitors and employees.
Yellowstone National Park has also set goals to reduce its carbon footprint and increase energy conservation. They plan to identify new buildings and major renovation projects that can achieve net-zero energy usage. The park aims to implement "smart building" controls and technology and meet or exceed the International Energy Conservation Code requirements for remodels and renovations. Additionally, they are working to improve water management and reduce fuel use and emissions by transforming the fleet and technologies used within the park.
The park also promotes initiatives that support the reduction of greenhouse gas (GHG) emissions from visitor transport. This includes providing public-use EV charging and electric transit options. They are committed to reducing waste, preventing pollution, and mitigating environmental liabilities. Yellowstone aims to serve as a leader in the National Park Service's efforts to adapt to and address the challenges posed by a changing climate.
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Frequently asked questions
The Air Quality Index (AQI) is used to measure air pollution. The AQI is calculated using standards and guidelines developed by the Environmental Protection Agency (EPA) and the World Health Organization (WHO).
As of March 23, 2025, the air quality in West Yellowstone Park, Montana, was reported as "Good". However, it is important to note that air quality can vary over time and that Yellowstone National Park spans parts of Wyoming, Montana, and Idaho. Therefore, the air quality may differ across the park.
Yellowstone National Park is downwind of significant pollutant sources, including power plants, agricultural areas, industry, and oil and gas development. Even emissions from over-snow vehicles, such as snowmobiles, can affect winter air quality.
Nitrogen (N) and sulfur (S) compounds deposited from the air can have harmful effects on ecosystem processes. While healthy ecosystems can naturally buffer a certain amount of pollution, once a threshold is passed, negative changes can occur. For example, acidification caused by N and S deposition can leach important cations from soils and water bodies, decreasing habitat quality.
The National Park Service works to address air pollution effects through science, policy, and planning. Efforts have been made to manage over-snow vehicle use, including reducing vehicle numbers and requiring the use of the best available technology to lower emissions. These changes have effectively improved air quality in the park.
