Kiera Jefferson
Air pollution is a growing problem, with 99% of the global population in cities breathing unsafe air. The main causes of smoke, smog, and particulate pollution are coal-fired power plants, factories, biomass burning, and vehicle emissions. In 2022, Mullanpur in India was the most polluted city in the world, with an average PM2.5 concentration of 185.5 μg/m³. However, it has since improved, with levels dropping to an average of 78.1 μg/m³. Despite this improvement, the top 132 most polluted cities still exceed the WHO air quality limit by over ten times. While it can be challenging to determine the least polluted city due to varying data availability and monitoring capabilities, some cities are known for their relatively clean air. Osaka, Japan, is often praised for its cleanliness, and Australian cities like Sydney and Perth are also considered to have good air quality due to their remote locations. Uppsala in Ontario, Canada, is another city mentioned for its clean air and small population.
| Characteristics | Values |
|---|---|
| Least polluted megacity in the world | Osaka, Japan |
| Cleanest air | Maine |
| Least polluted city | Seattle |
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What You'll Learn
Osaka, Japan
The main sources of pollution in Osaka are vehicular and factory emissions. With 2.6 million residents, the city experiences significant traffic pollution from personal cars, motorbikes, and heavy-duty vehicles. Additionally, the numerous factories around Osaka's limits contribute to industrial smoke and combustion-related pollution, especially from the burning of fossil fuels like coal. Despite these challenges, Osaka has taken proactive steps to address its pollution levels.
Osaka has implemented initiatives to reduce waste generation and promote reuse and recycling. The "Osaka Blue Ocean Vision" action plan, developed in 2021, aims to achieve "zero new pollution from marine plastic litter by 2050." The city government is committed to protecting biodiversity, creating a comfortable urban environment, and contributing to global environmental efforts. Osaka also launched the Team OSAKA Network platform in 2016 to facilitate partnerships among industry, academia, and government, fostering economic revitalization and promoting the development of decarbonized cities.
Osaka's air quality is monitored through the Osaka Air Quality Index (AQI), which provides real-time, historical, and forecast data on fine particulate matter (PM2.5) and other pollutants like NO2 and SO2. The city's overall AQI has been rated as 'moderate,' indicating that while Osaka faces some pollution challenges, it is not among the most polluted cities. Osaka's moderate rating also highlights the city's efforts to balance economic development with environmental sustainability.
In conclusion, Osaka, Japan, is a large, vibrant city that has taken notable steps to address pollution and environmental issues. While it faces challenges common to highly developed urban areas, Osaka's commitment to sustainability and collaboration among various stakeholders is contributing to its goal of becoming an environmentally advanced city. The city's proactive initiatives and focus on reducing pollution set a positive example for other metropolitan areas striving to improve their environmental performance.
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Maine, USA
Bangor, Maine, is one of the least polluted cities in the United States. The American Lung Association's 2025 "State of the Air" report ranks Bangor as one of the cleanest cities in the country in terms of ozone and short-term particle pollution. The city has some of the best air quality in the nation, with zero unhealthy days of high ozone levels recorded in Penobscot County.
Bangor's clean air can be attributed to various factors, including its geographical location and the state's efforts to improve air quality. As the easternmost city in the continental United States, Bangor may benefit from ocean breezes that can disperse pollutants. Additionally, Maine has implemented the Transportation and Climate Initiative (TCI) Program, which aims to improve air quality, invest in cleaner public transportation, and reduce carbon emissions contributing to climate change.
However, not all areas in Maine enjoy the same level of clean air. The Portland-Lewiston-South Portland metro area has been ranked among the most polluted cities for ozone pollution, with a worsening year-round measure. Washington County in Maine has also declined in air quality, dropping from a B grade to a C grade in ozone levels.
Despite these challenges, Maine continues to prioritize air quality improvements. The state's large forested areas and national parks, such as Acadia National Park and Baxter State Park, contribute to its overall clean air and make tourism a mainstay of the state's economy. Maine is also one of the world's largest pulp-paper producers due to its abundant forest resources.
In summary, Bangor, Maine, stands out as a leader in clean air among US cities, while the state as a whole demonstrates a commitment to mitigating air pollution and preserving the natural environment that attracts tourists and supports vital industries.
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New England, USA
New England, a region in the northeast of the United States, is known for its relatively clean air. The region benefits from its geographical location, as east coast air generally comes off the land due to west-to-east movement, resulting in cleaner air quality compared to other regions. The abundant tree coverage in New England, particularly in states like Maine, also contributes to the region's good air quality.
Within New England, certain states and cities stand out for their low pollution levels. Vermont, bordered by Canada, New York, Massachusetts, and New Hampshire, is known for its verdant valleys and mountains. The state's natural environment, including its contribution to the American Revolution with the "Green Mountain Boys," makes it a notable example of low pollution in the region.
Maine, another New England state, surprises some with its absence from lists of the least polluted places. However, residents and visitors alike praise its clean air, attributing it to the state's tree coverage. The Pacific Northwest, while not in New England, is also mentioned for its even higher tree coverage, which contributes to cleaner air.
When considering pollution, it's important to distinguish between air pollution and other forms, such as noise pollution. For example, Washington, D.C., is mentioned for its noise pollution due to constant sirens and the low 'signal-to-noise' ratio caused by the city's architecture.
While New England is known for its relatively clean air, specific cities within the region may vary in their pollution levels due to various factors, including topography and local industries. Overall, the region benefits from its geographical location and natural features, contributing to cleaner air quality compared to other parts of the country.
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Tokyo, Japan
Historically, Japan experienced a period of intense industrialization post-World War 2, with a rapid increase in factories and a reliance on fossil fuels, which contributed to air pollution. The problem was further exacerbated during the country's period of high economic growth in the 1950s, when a large amount of oil and coal were burned to meet energy demands. As a result, pollution, particularly sulphur oxides (SOx), became a serious issue, leading to respiratory disorders among residents in industrial cities.
Today, while air pollution remains a concern in Tokyo, the city has made significant strides towards improving its air quality. According to IQAir, as of November 20, 2024, Tokyo was listed among the capital cities with the cleanest air. This improvement can be attributed to the city's strict emissions regulations and efforts to reduce auto and industrial pollution. Tokyo has also invested in natural spaces for health, well-being, and air quality, with thousands of trees amidst its famous neon-covered buildings.
In terms of specific pollution control measures, Tokyo has introduced tighter regulations on automobile exhaust gases and promoted the spread of low-emission vehicles. Additionally, the heating for housing is mostly electric, which contributes to cleaner air. The city has set ambitious sustainability goals, aiming to become a leader in sustainability by 2030 and a zero-emission city by 2050.
Compared to other cities, Tokyo's air pollution is relatively well-managed. A resident of Shanghai noted that while the air pollution in Shanghai felt "stale," they had never encountered any noticeable pollution in their three years in Tokyo. They attributed this difference to the lower number of cars in Tokyo for a city of its size and the strict pollution control measures in place.
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Seattle, USA
While I cannot confirm that Seattle is the least polluted city in the United States or the world, Seattle has made significant strides in reducing pollution and improving air quality. The city has set ambitious climate goals to become a greener, healthier, and more prosperous place to live.
To achieve these goals, the Seattle Department of Transportation (SDOT) and the Office of Sustainability and Environment (OSE) are working together to understand the community's climate priorities and implement changes. As part of this effort, Mayor Bruce Harrell signed an Executive Order directing city departments to reduce or eliminate greenhouse gas emissions in the transportation sector. The city plans to create three low-pollution neighbourhoods by 2028, with designated areas for pilot projects, policy improvements, and infrastructure developments to enhance air and water quality.
One example of Seattle's initiatives is the focus on electric vehicles and e-cargo bike deliveries, reducing emissions from traditional transportation methods. Additionally, the city is prioritizing people over vehicles in certain areas, such as Occidental Avenue in Pioneer Square. These measures contribute to Seattle's overall goal of creating a more sustainable and livable environment for its residents.
Seattle's efforts to combat pollution align with the broader impact of the Clean Air Act in the United States. This landmark legislation has driven pollution reduction for over 50 years, and the U.S. Environmental Protection Agency plays a critical role in monitoring and enforcing air quality standards. However, recent staffing and funding cuts to the agency may hinder their ability to continue this vital work.
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Frequently asked questions
There are a few contenders for the least polluted city. Osaka, Japan, is often cited as one of the least polluted megacities in the world, with over 10 million people in the metropolitan area. Other sources suggest that Tokyo is even cleaner. More generally, Japan is considered to have very low air pollution, partly due to its geographical proximity to the ocean. Some people also suggest that Maine and New England, USA, have very clean air due to their tree coverage.
The topography of a city can affect its pollution levels. For example, pollution can become concentrated in a valley and remain there due to the shape of the land. The surrounding environment also plays a role, as tree coverage can improve air quality.
Cities with higher populations may have higher levels of pollution due to increased human activity, such as industrial production and vehicle use. However, this is not always the case, as some smaller cities or towns may have higher pollution levels due to specific local factors, such as the presence of a large number of idling semi-trucks.
Climate change can increase the risk of wildfires, which produce smoke and spread dangerous particle pollution. Changes in weather patterns, such as wind and rainfall, can also disperse or concentrate pollution.
