Brian Barton
Seattle, a city known for its natural beauty, has been facing challenges when it comes to air and water pollution. The city has implemented various initiatives to address these issues, such as reducing solid waste emissions and employing a clean diesel program. Despite these efforts, Seattle has been ranked among the worst cities in the United States for air pollution, with frequent unhealthy ozone and PM2.5 days. The city's growing population and climate change are expected to further strain its infrastructure and increase emissions, impacting air quality. Additionally, Seattle's waterways, including the Duwamish River, are polluted due to stormwater runoff and historical industrial pollution. The city is working towards cleaning up these water bodies and advancing solutions to reduce pollution.
| Characteristics | Values |
|---|---|
| Air quality | Seattle's air quality is generally considered "good", but the city has a high number of unhealthy pollution days. |
| Water quality | The drinking water quality is excellent, but major bodies of water like the Puget Sound and the Duwamish River are polluted due to stormwater runoff and historical industrial pollution. |
| Pollution sources | Pollution sources include industrial facilities, seafaring ships, motor vehicles (especially heavy-duty trucks and diesel engines), and wildfires. |
| Initiatives to improve air quality | Seattle is implementing initiatives such as reducing solid waste emissions, employing a clean diesel program, using Green Stormwater Infrastructure (GSI), and street sweeping to mitigate pollution. |
| Rankings | Seattle has been ranked among the worst cities in the US for air pollution, with a high number of unhealthy ozone and PM2.5 days. |
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What You'll Learn
Seattle's air quality is often rated as 'good'
Seattle's air quality is often rated as good, but the city has also been listed as one of the worst cities in the US for air pollution. Seattle's air quality index (AQI) ratings are typically categorised as "good", but the city has experienced an increasing number of unhealthy pollution days, or 24-hour spikes, in recent years.
On average, Seattle experiences 14.2 unhealthy pollution days a year, with 7 owing to high ozone and 7.2 owing to high PM2.5. The US Environmental Protection Agency (EPA) recommends no more than 3.2 unhealthy pollution days each year for each pollutant. The frequency of Seattle's pollution spikes is more than double the targeted allowance. From a broader perspective, the 14.2 unhealthy pollution days represent just 4% of the year. Other days in Seattle tend to achieve "good" to "moderate" US AQI ratings.
Seattle's PM2.5 pollution is largely attributed to the large concentration of industrial facilities and seafaring ships in South Park and Georgetown. However, the majority of emissions come from the city's motor vehicles, especially heavy-duty trucks and other diesel engines. Residents of Georgetown and South Park are familiar with the smoke from freight trucks hauling cargo from the port to rail yards. On an average weekday, over 8,000 commutes are taken by freight trucks.
Seattle has implemented several measures to improve air quality and reduce pollution. The city has been advancing solutions to reduce pollution in waterways through regional partnerships. Seattle is also addressing solid waste emissions by capturing waste gas to burn as energy rather than flaring it into the air. Additionally, a clean diesel programme has been in place since 2001 to shift heavy-duty trucks to ultra-low-sulphur diesel fuel, significantly reducing the number of particulates released. The city has also removed 475 tons of pollutants from the roads via street sweeping since 2016, preventing around 150 tons of pollutants from entering local waterways.
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The city has unhealthy ozone and PM2.5 days
Seattle has been ranked among the worst cities in the U.S. for air pollution. According to the American Lung Association's (ALA) 2020 report card, the city received a failing grade for both 24-hour PM2.5 and ozone levels. The report revealed that Seattle exceeded the allowable targets for both pollutants, with an average of 7 high ozone days and 7.2 high PM2.5 days annually from 2016 to 2018. This trend of declining air quality in King County, where Seattle is located, is concerning.
The city's poor performance in reducing unhealthy ozone and PM2.5 days has significant health implications. PM2.5 pollution, consisting of tiny particles that can be inhaled, is linked to exacerbating respiratory and cardiovascular issues. Research has also indicated potential impacts on cognition and children's test scores following frequent exposure to high levels of PM2.5. The Puget Sound's Clean Air Agency found that areas in the Duwamish Valley experience an additional 400 cancer cases per 100,000 people due to air pollution.
The primary sources of PM2.5 pollution in Seattle include industrial facilities and seafaring ships in South Park and Georgetown, as well as emissions from motor vehicles, particularly heavy-duty trucks, and other diesel engines. The impact of these hyperlocal emission sources is severe, especially for residents living near major roadways, who experience even higher levels of air pollution.
To address this issue, Seattle has implemented several measures. One initiative is the Clean Diesel Program, which aims to transition heavy-duty trucks to ultra-low-sulfur diesel fuel, thereby reducing the number of particulates released into the atmosphere. This program began in 2001 and has helped mitigate the number of unhealthy PM2.5 days. Additionally, Seattle is working with partners like the Puget Sound Clean Air Agency and Seattle-King County Public Health to provide resources, education, and cooling locations for residents to access during smoke events.
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Wildfires cause poor air quality
Seattle has mixed air pollution ratings. While the city has generally "good" US Air Quality Index (AQI) levels, it has failed to meet federal targets for allowable unhealthy ozone days and unhealthy PM2.5 days. On average, Seattle experiences 14.2 unhealthy pollution days a year, with 7 owing to high ozone and 7.2 owing to high PM2.5. The US Environmental Protection Agency (EPA) recommends no more than 3.2 unhealthy pollution days each year for each pollutant.
The quality of Seattle's air is impacted by a range of factors, including industrial facilities, seafaring ships, motor vehicles, and wildfires. Wildfires are a significant contributor to poor air quality in Seattle and have had dramatic impacts in recent years, exposing millions of people to elevated and hazardous fine particulate matter (PM2.5) concentrations. Wildfire smoke is comprised of a mixture of gaseous pollutants, hazardous air pollutants (HAPs), water vapour, and particle pollution. Particle pollution, or particulate matter (PM), is a general term for a mixture of solid and liquid droplets suspended in the air. The fine particles (PM2.5) from wildfire smoke are of particular health concern, as they can exacerbate respiratory and cardiovascular problems, and frequent high exposures have been shown to affect cognition and children's test scores.
The impact of wildfire smoke on air quality can vary depending on the fuel type and amount of fuel consumed. For example, the consumption of deep organic fuels can result in higher emissions of PM2.5. Wildfire smoke can also impact air quality in areas beyond the immediate vicinity of the fire, as smoke plumes can travel long distances. While staying inside can help reduce exposure to wildfire smoke, it is not always a fix, as indoor air quality can also be affected.
Seattle has been taking measures to improve its air quality and reduce pollution. These measures include reducing solid waste emissions by capturing waste gas to burn as energy, employing a clean diesel program to reduce the number of particulates released by heavy-duty trucks, and using Green Stormwater Infrastructure (GSI) to manage and reduce stormwater pollution. Additionally, the city is working with various partners, including the Puget Sound Clean Air Agency and Seattle-King County Public Health, to provide resources, education, and cooling locations for residents during smoke events.
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Seattle's waterways are polluted
The Puget Soundkeeper Alliance identifies many sources of pollution affecting Puget Sound, including oil spills, pharmaceuticals, industrial waste, sewage, fossil fuel production, and stormwater runoff. The Alliance also highlights the issue of invasive species, viruses, bacteria, silt, and sediment, which can all negatively impact water quality.
Agricultural pollution is a significant contributor to waterway pollution in Seattle and across the United States. Large Concentrated Animal Feeding Operations (CAFOs) produce raw manure, which often exceeds the capacity of the available land, leading to contamination of waterways with nitrates and fecal coliform bacteria. Additionally, sediment washed off bare fields can destroy fish habitats, and nutrient pollution from fertilizers causes harmful algal blooms, creating toxic or low-oxygen conditions.
The city of Seattle has implemented measures to address waterway pollution, such as street sweeping, which has removed 475 tons of pollutants from roads since 2016. The city also utilizes Green Stormwater Infrastructure (GSI) to manage and treat polluted stormwater, mimicking the natural water cycle. Seattle is also working towards cleaning up the Duwamish River in partnership with King County, Port of Seattle, and The Boeing Company, with a goal of restoring 177 acres by 2030.
Despite these efforts, Seattle continues to face challenges in maintaining healthy waterways. The city's growing population and increasing strain on infrastructure contribute to rising residential daily emissions. Climate change also plays a role, with warming temperatures extending the ozone season and intensifying the formation of ozone, a harmful pollutant.
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Seattle's air pollution disproportionately affects people of colour
Seattle generally enjoys \"good\" air quality, according to its air quality index (AQI) ratings. However, the city has failed to meet federal targets for allowable unhealthy ozone and PM2.5 days. On average, Seattle experiences 14.2 unhealthy pollution days a year, with 7 of those days owing to high ozone levels and the other 7.2 to high PM2.5 levels.
The primary sources of Seattle's air pollution are motor vehicles, particularly heavy-duty trucks and other diesel engines. The impact of these hyperlocal emission sources is severe, with residents of South Park and Georgetown, who are predominantly people of colour, being all too familiar with the smoke from freight trucks hauling cargo from the port to rail yards.
A 2008 study by Puget Sound's Clean Air Agency found that the Duwamish Valley, which includes South Park and Georgetown, experiences an extra 400 cancer cases per 100,000 people. For residents who live near major roadways, the situation is even more dire, with an additional 40 to 80 cancer cases per 100,000 people.
Furthermore, according to a 2021 study by researchers at the EPA-funded Center for Air, Climate, and Energy Solutions, people of colour in the United States breathe more particulate air pollution on average, regardless of income level or region. The study found that African Americans, Hispanics, Asians, and other people of colour are disproportionately exposed to fine particulate matter (PM2.5), which can cause serious respiratory and cardiovascular problems, especially for vulnerable populations.
In Seattle, due to historical land use patterns, the majority of residents who live closest to heavily trafficked roadways are people of colour and people with low incomes. As a result, they experience poorer air quality compared to the rest of the city, as the impact of local emission sources is more severe in these areas.
Therefore, it is evident that Seattle's air pollution disproportionately affects people of colour, who are more likely to reside in areas with higher levels of air pollution and are, therefore, exposed to higher levels of harmful pollutants. Addressing this environmental injustice requires effective regulations and interventions that specifically consider the racial disparities in air pollution exposure.
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Frequently asked questions
Seattle's air quality is mixed. While the city consistently averages "good" US Air Quality Index (AQI) ratings, it has also experienced an increasing number of unhealthy pollution days, or 24-hour spikes, in recent years.
Seattle's air pollution is largely attributed to the large concentration of industrial facilities and seafaring ships in South Park and Georgetown. The majority of emissions, however, come from the city's motor vehicles, especially heavy-duty trucks and other diesel engines.
Seattle is taking several measures to improve air quality, including:
- Reducing solid waste emissions by capturing waste gas to burn as energy.
- Implementing a clean diesel program to shift heavy-duty trucks to ultra-low sulfur diesel fuel.
- Cleaning up the Duwamish River, in partnership with King County, Port of Seattle, and The Boeing Company.
- Removing pollutants from roadways through street sweeping.
Air pollution can have significant health impacts on Seattle residents. High levels of PM2.5, or small particle pollution, can exacerbate respiratory and cardiovascular problems and have been shown to affect cognition and children's test scores. Wildfire smoke, which has contributed to poor air quality in Seattle, can cause burning eyes, a runny nose, and can aggravate heart and lung diseases.
