Kiera Jefferson
Boston's air quality is generally considered clean, meeting all US Environmental Protection Agency (EPA) targets for criteria pollutants. However, despite these achievements in reduced pollution levels, Boston residents still experience unhealthy air pollution for an average of 1.3 days a year, primarily due to ozone pollution. The city has implemented various initiatives to address air pollution, including the Air Pollution Control Commission, which oversees parking freezes and the Building Emissions Reduction and Disclosure Ordinance (BERDO) to reduce emissions from large buildings. Boston College's Global Observatory on Planetary Health has also revealed the harmful health impacts of air pollution, including an estimated 2,780 deaths in Massachusetts in 2019, underscoring the need for continued efforts to improve air quality in the city.
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What You'll Learn
Boston's air quality is generally clean
Boston's air quality is generally considered clean, as it meets all US Environmental Protection Agency (EPA) targets for criteria pollutants, including PM2.5, PM10, ozone, carbon monoxide (CO), nitrogen dioxide (NO2), and sulphur dioxide (SO2). The city has made significant progress in reducing pollution levels, with emissions falling by 40% since 2005, despite a growing population and job market. This success is attributed to the implementation of stringent limits and regulations on industry, transport, and personal activities.
Boston's air pollution levels for PM2.5 and ozone have shown drastic improvements since 2003, with the number of unhealthy pollution days dropping from 26.1 to 1.3. However, ozone pollution remains the primary cause of these unhealthy days, and Boston received a "C" grade for ozone from the American Lung Association (ALA). Individual pollution exposure can vary depending on the neighbourhood and proximity to major emission sources, with residents near construction, major roadways, transportation hubs, and industrial complexes experiencing higher pollution levels.
To further improve air quality, Boston has initiatives such as parking freezes to reduce car-related pollution and the Building Emissions Reduction and Disclosure Ordinance (BERDO) to gradually lower emissions from large buildings. The city also funds community-based projects that aim to reduce air pollution and carbon emissions through the Community Clear Air Grant program. These efforts align with the Clean Air Act and Massachusetts State Implementation Plan (SIP) to ensure the state meets air quality standards.
While Boston's air quality is generally clean, there are still concerns about the impact of pollution on public health. Studies have linked fine particulate air pollution to various non-communicable diseases in adults, including cardiovascular disease, stroke, lung cancer, and diabetes. Additionally, air pollution has been associated with cognitive loss in children. These health effects occur even at pollution levels below current EPA standards, underscoring the need to continuously strive for improved air quality.
Overall, Boston's air quality is considered acceptable for most individuals, but sensitive groups may experience symptoms from long-term exposure. The city's efforts to reduce pollution and its commitment to meeting air quality standards contribute to maintaining a generally clean environment for its residents.
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Ozone pollution is a concern
Boston's air quality is generally considered clean, meeting all US Environmental Protection Agency (EPA) targets for criteria pollutants. However, ozone pollution is a concern for the city. While Boston's ozone levels pass federal guidelines, it is the primary cause of the average 1.3 unhealthy pollution days experienced annually. As a result, the American Lung Association (ALA) has rated Boston a "C" grade for ozone, indicating room for improvement. Out of 229 metropolitan areas included in the ALA's annual State Of The Air report, the Boston-Worcester-Providence area ranked 38th for high ozone days nationally.
Ozone is a highly corrosive gas pollutant and a key component of smog. It is formed when volatile organic compounds (VOCs) and nitrogen oxides (NOx) react with sunlight. While ozone in the upper atmosphere is beneficial as it protects life on Earth from harmful ultraviolet (UV) rays, ground-level ozone is a harmful pollutant. Ground-level ozone can irritate the respiratory system, aggravate asthma and other lung diseases, and even cause permanent lung damage over prolonged exposure.
Boston's ozone pollution is largely attributed to major emission sources, including new construction, major roadways, transportation hubs, and industrial complexes such as factories, refineries, and power plants. Individual pollution exposure can vary significantly depending on neighbourhood proximity to these sources. Residents living closer to these pollution sources are more likely to experience higher ozone levels and associated health risks.
Efforts to reduce ozone pollution in Boston have shown progress. Since 2003, the number of unhealthy pollution days in the city has dropped from 26.1 to 1.3, with significant reductions in commercial, industrial, and large residential emissions. This improvement is notable given Boston's growing population and job market. The success is attributed to stricter local, state, and federal regulations targeting various industries, transport, and personal activities.
However, recent reports from the American Lung Association indicate a decline in Boston's air quality, with the city experiencing an increase in high ozone days. This decline is partly due to extreme heat, drought, and wildfires, which elevate ozone levels. Despite meeting EPA targets, Boston still faces the challenge of reducing ozone pollution to ensure healthier air for its residents, especially those in vulnerable populations.
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PM2.5 levels are unhealthy
Boston's air quality is generally considered clean, as it meets all US Environmental Protection Agency (EPA) targets for criteria pollutants. However, despite the city's success in achieving reduced pollution levels, Boston residents still experience about 1.3 days of unhealthy air pollution per year. While this is a significant improvement from the 26.1 unhealthy days recorded in 2003, it still presents health risks, especially for vulnerable groups.
PM2.5 levels are a significant contributor to Boston's air pollution. PM2.5 refers to fine particulate matter with a diameter of 2.5 microns or less. These particles are a mixture of solids and aerosols, containing a range of chemical species, including inorganic ions, metallic compounds, elemental carbon, and organic compounds. They are primarily produced by the combustion of gasoline, oil, diesel fuel, or wood, as well as industrial processes and motor vehicle exhaust.
When PM2.5 levels are unhealthy, the air quality is considered hazardous, and it can have adverse effects on human health. Unhealthy PM2.5 levels are typically above 35 μg/m3, and they can cause issues for people with existing breathing problems such as asthma. Even lower levels of PM2.5 exposure, such as those below 12 μg/m3, can be considered unhealthy by more stringent standards, such as the World Health Organization's (WHO) guidelines.
The health risks associated with unhealthy PM2.5 levels are significant. Short-term exposure can lead to eye, nose, throat, and lung irritation, coughing, sneezing, a runny nose, and shortness of breath. More seriously, long-term exposure to fine particles has been linked to increased mortality from heart disease, higher rates of chronic bronchitis, reduced lung function, and lung cancer. Vulnerable groups, including children, teenagers, older adults, pregnant women, and people with heart or respiratory problems, are particularly sensitive to the effects of unhealthy PM2.5 levels.
To protect public health, it is essential to monitor and manage PM2.5 levels. New York State, for example, alerts the public when particle pollution is expected to be unhealthy and recommends that schools and childcare providers suspend outdoor activities. Additionally, the use of air purifiers and HEPA-grade filters can help reduce indoor PM2.5 levels, providing cleaner air for residents.
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Air pollution causes health issues
Boston's air quality is generally considered clean, as it meets all EPA targets for criteria pollutants. However, Boston residents still experience about 1.3 days of unhealthy air pollution annually, which mainly comprises ozone pollution. While this passes federal guidelines, it is still detrimental to health.
Air pollution is the presence of one or more contaminants in the atmosphere, such as dust, fumes, gases, mists, odours, smoke, or vapours, in quantities that can be harmful to human health. The main exposure pathway is through the respiratory tract, but pollutants can also enter the bloodstream and travel to organs, causing systemic damage.
The health effects of air pollution are far-reaching and impact people of all ages. Short-term exposure to air pollutants can cause coughing, itchy eyes, and exacerbate breathing and lung diseases. It can also trigger asthma attacks, cause wheezing and coughing, and lead to respiratory infections. Long-term exposure increases the risk of lung cancer, heart disease, stroke, chronic obstructive pulmonary disease, pneumonia, and cataract. It is also linked to adverse pregnancy outcomes, diabetes, cognitive impairment, and neurological diseases.
Particulate matter (PM), especially PM2.5, is of particular concern. These fine particles can penetrate deep into the lungs and enter the bloodstream, causing systemic damage to tissues and cells. They can impair blood vessel function, speed up arterial calcification, and alter the size of a child's developing brain, increasing the risk for cognitive and emotional problems later in life.
Other common pollutants include carbon monoxide (CO), ozone (O3), nitrogen dioxide (NO2), and sulphur dioxide (SO2). Carbon monoxide is especially dangerous as it is odourless and can lead to fatal consequences without detection. Ozone is a highly corrosive gas and a key component of smog, which is why it is the primary cause of unhealthy air days in Boston.
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Boston's pollution levels are improving
Boston's air pollution levels are improving, with the city making significant strides towards cleaner air. Despite being within the US Environmental Protection Agency (EPA) targets for criteria pollutants, Boston has not rested on its laurels and continues to enhance its air quality. The city has successfully reduced pollution levels, ensuring that residents breathe cleaner air.
One of the key indicators of Boston's progress is the decrease in unhealthy pollution days. Since 2003, the number of such days has plummeted from 26.1 to just 1.3 per year. This improvement is remarkable, especially considering Boston's growing population and thriving job market. The city's Gross City Product (GCP), a metric of economic growth, surged from $91 billion to $129 billion during this period. Yet, Boston's emissions took a downward turn, decreasing by 40%, from 15.0 to 9.0 metric tons annually. This reduction in emissions is a testament to the effectiveness of local, state, and federal regulations, which have implemented stricter limits on industry, transport, and personal activities.
Boston's ozone pollution, a significant contributor to unhealthy air days, has witnessed improvements. While it meets federal guidelines, the American Lung Association (ALA) has rated Boston a "C" grade in this area, indicating room for further progress. Nonetheless, Boston has made notable strides, ranking 38th out of 229 metropolitan areas in the ALA's State of the Air report for high ozone days.
The city's efforts to curb emissions from stationary sources have been particularly effective. Commercial, industrial, and large residential emissions have decreased significantly, contributing to the overall improvement in air quality. Boston's updated Building Emissions Reduction and Disclosure Ordinance (BERDO) is a crucial initiative in this regard, aiming for net-zero emissions from large buildings by 2050. Additionally, parking freezes have played a role in reducing vehicle emissions, and the city's parking freeze program is aligned with the Massachusetts State Implementation Plan (SIP) under the federal Clean Air Act.
While Boston's air pollution levels are improving, it is important to recognize that no level of pollution exposure is entirely without health impacts. Fine particulate matter pollution, even below the EPA's standard, poses a formidable public health threat. It is linked to cardiovascular disease, stroke, lung cancer, and diabetes in adults. Therefore, Boston's continued commitment to reducing pollution levels is vital to safeguard the health and well-being of its residents.
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Frequently asked questions
Boston's air quality ranks 11th worst in the state out of 24 cities. Townsend, Amesbury, and Natick are the worst in the state.
Boston's air pollution is caused by a combination of commercial, industrial, and large residential emissions, as well as cars and other vehicles.
Boston has implemented various initiatives to reduce air pollution, including the Building Emissions Reduction and Disclosure Ordinance (BERDO), which aims for net-zero emissions from large buildings by 2050, and the Community Clear Air Grant program, which funds community-based projects that reduce air pollution and carbon emissions.
Air pollution has been linked to various adverse health effects in Boston, including respiratory issues, cognitive loss in children, and non-communicable diseases in adults such as cardiovascular disease, stroke, lung cancer, and diabetes.
