Meghan Hodges
Hamilton, a city in Ontario, Canada, has a population of 536,000 people and is heavily involved in the manufacturing industry, particularly metal production. As a result of its large population and industrial activity, Hamilton is subject to several polluting factors, including vehicle emissions, industrial fumes, and the burning of organic materials. In 2019, Hamilton's PM2.5 average was 10.1 μg/m³, which, while considered ''good', was only 0.1 units away from the World Health Organization's target for perfect air quality. More recently, in June 2025, Hamilton's AQI levels fluctuated between 'good' and 'moderate', with a worst reading of 61. Researchers have also found that benzo(a)pyrene levels in the city exceeded provincial guidelines, indicating that air pollution in Hamilton could be as harmful as smoking a cigarette a day.
| Characteristics | Values |
|---|---|
| Population | 536,000 |
| PM2.5 average (2019) | 10.1 μg/m³ |
| PM2.5 average (June 2019) | 12 μg/m³ |
| PM2.5 average (July 2019) | 13.7 μg/m³ |
| PM2.5 average (November 2019) | 13.5 μg/m³ |
| PM2.5 average (December 2019) | 13.8 μg/m³ |
| PM2.5 average (August 2019) | 8.4 μg/m³ |
| PM2.5 average (September 2019) | 8 μg/m³ |
| PM2.5 average (October 2019) | 7 μg/m³ |
| AQI (9 June 2025) | 55 (Moderate) |
| AQI (9 June 2025, 5:09 AM) | 48 (Good) |
| AQI (9 June 2025, 10:09 PM) | 61 (Moderate) |
| Pollution causes | Vehicular fumes and emissions, factory emissions, organic material burning |
| Pollutants | Nitrogen dioxide, benzo(a)pyrene, ground-level ozone, inhalable particulates (PM10), respirable particulates (PM2.5) |
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What You'll Learn
- Hamilton's air pollution is caused by vehicles, factories, and organic material burning
- The city's air quality is impacted by ground-level ozone (O3) and nitrogen dioxide (NO2)
- Benzo(a)pyrene, a carcinogen, is present in the air from fossil fuel combustion
- Particulate matter PM2.5 and PM10 are linked to adverse health effects
- Hamilton's air pollution levels vary monthly, with June to December being the worst
Hamilton's air pollution is caused by vehicles, factories, and organic material burning
Hamilton, a city in Ontario, Canada, has a population of about 536,000 people. It is heavily industrialized, with a significant presence in the manufacturing industry, particularly in metal production. As a result of its large and growing population, coupled with its status as an industrial hub, Hamilton is subject to some polluting factors. The city experiences higher readings of PM2.5, a measure of hazardous particulate matter 2.5 micrometres or less in diameter.
Vehicular fumes and emissions are a prominent source of air pollution in Hamilton, as is common in many cities worldwide. The level of vehicle use across Hamilton has increased slightly over the past decade, contributing to elevated levels of nitrogen dioxide (NO2). NO2 is a pollutant formed during the combustion of fuels such as gasoline, diesel, and coal, and it has significant health impacts on the residents of Hamilton.
Additionally, Hamilton's industrial activities contribute to air pollution. The city's involvement in metal production, particularly in steel mills and coke ovens, releases pollutants such as benzo(a)pyrene (BaP), a known carcinogen. While efforts have been made to improve infrastructure and operations to reduce BaP emissions, Hamilton's industrial activities remain a significant source of air pollution.
Another factor contributing to Hamilton's air pollution is the burning of organic material, such as firewood during the winter months. This practice, along with the increased consumption of electricity for heating, leads to spikes in PM2.5 levels during the winter. As a result, Hamilton experiences higher pollution levels during the winter, similar to many other cities.
Overall, Hamilton's air quality is respectable on a global scale, but it could improve to meet the World Health Organization's (WHO) target goals for perfect air quality. By addressing emissions from vehicles, factories, and organic material burning, Hamilton can take significant steps towards improving its air quality and reducing the health risks associated with air pollution.
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The city's air quality is impacted by ground-level ozone (O3) and nitrogen dioxide (NO2)
Hamilton, a city in Ontario, Canada, has a population of about 536,000 people and is heavily involved in the manufacturing industry, particularly in metal production. As a result of its large and growing population, as well as its status as an industrial hub, the city is subject to some polluting factors. Vehicular fumes and emissions stand out as one of the more noticeable sources of air pollution in Hamilton, as is common in many cities worldwide.
The level of vehicle use in Hamilton has increased slightly over the past decade, yet overall NO levels have decreased, likely due to improved engine technologies. Benzo [a] pyrene (BaP), a pollutant emitted by the burning of fossil fuels, is capable of causing cancer in animals and humans. BaP levels were found to be higher than provincial guidelines in all urban areas of Hamilton, indicating that the pollutant is affecting the entire city. The principal sources of BaP in Hamilton are releases from coke oven operations within the steel industry. However, significant decreases in ambient BaP levels have been observed since the late 1990s due to improvements in infrastructure and increased attention to operation and maintenance procedures.
In addition to ground-level ozone and nitrogen dioxide, Hamilton's air quality is also impacted by particulate matter (PM2.5 and PM10). PM2.5 refers to hazardous particulate matter that is 2.5 micrometers or less in diameter, while PM10 refers to inhalable particulate matter with a diameter of 10 micrometers or less. In 2019, Hamilton had a PM2.5 average of 10.1 μg/m³, placing it in the 'good' ratings bracket. However, the city saw a rise in its PM2.5 count in the months of June and July, with December being the most polluted month of the year. PM10, on the other hand, has decreased by about 21% over the past decade, likely due to better vehicle performance, improved management of dust by industries, and enhanced street sweeping practices.
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Benzo(a)pyrene, a carcinogen, is present in the air from fossil fuel combustion
Hamilton, Ontario, Canada, is a heavily populated city with a significant presence in the manufacturing industry. The city is heavily industrialized, with metal production and a large population, which are factors that contribute to air pollution. Hamilton's air quality is respectable in global rankings, but it fares poorly when compared to other Canadian cities.
Benzo(a)pyrene, also known as BaP, is a polycyclic aromatic hydrocarbon (PAH) and a Group 1 carcinogen. It is the result of incomplete combustion of organic matter at temperatures between 300 °C (572 °F) and 600 °C (1,112 °F). BaP is a procarcinogen, meaning its carcinogenicity depends on its enzymatic metabolism to BaP diol epoxide, which binds to DNA, causing mutations and cancer. It is included in the U.S. Environmental Protection Agency's Priority Pollutant List and is classified as mutagenic, teratogenic, and reproductive toxic.
BaP is released from coke oven operations within the steel industry, which is a significant source of this pollutant in Hamilton. While ambient BaP levels have decreased since the late 1990s due to infrastructure improvements and better operation and maintenance procedures for coke ovens, it remains a concern. BaP is one of many PAHs released from coking operations, but it is the most potent and well-studied PAH carcinogen.
BaP is also found in automobile and industrial exhausts, tobacco smoke, and charbroiled meat. Its presence in the atmosphere is mostly particle-bound, and it enters soils and waters through deposition. The detoxification enzymes cytochrome P450 1A1 (CYP1A1) and cytochrome P450 1B1 (CYP1B1) play a protective role against BaP toxicity. CYP1A1 acts to protect mammals from low doses of BaP, and its absence can lead to toxic bioactivation.
In summary, Benzo(a)pyrene (BaP) is a carcinogen present in the air in Hamilton, primarily from fossil fuel combustion in industrial processes and transportation. While efforts have been made to reduce BaP levels, it remains a significant pollutant and a health concern for the city's residents.
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Particulate matter PM2.5 and PM10 are linked to adverse health effects
Hamilton, a city in Ontario, Canada, has a population of about 536,000 people and is heavily involved in the manufacturing industry, particularly in metal production. The city's large and growing population, coupled with its status as an industrial hub, means that Hamilton is subject to some polluting factors. The city's main sources of air pollution are vehicular fumes and emissions, as well as factory emissions and organic material burning.
In 2019, Hamilton recorded a PM2.5 average of 10.1 μg/m³, which placed it in the ''good' ratings bracket. However, this reading was only 0.1 units away from being moved down into the World Health Organization's (WHO) target goal for perfect air quality. Despite this relatively positive rating, Hamilton still has room for improvement when it comes to air quality, especially when compared to other cities in Canada.
Short-term exposure to PM10 has been linked to the worsening of respiratory diseases, including asthma and chronic obstructive pulmonary disease (COPD), often leading to hospitalisation. The effects of long-term exposure to PM10 are less clear, but several studies suggest a link to respiratory mortality. PM2.5 is associated with an even greater proportion of adverse health effects related to air pollution. Short-term exposure to PM2.5 has been linked to premature mortality, increased hospital admissions for heart or lung causes, acute and chronic bronchitis, asthma attacks, emergency room visits, respiratory symptoms, and restricted activity days. Long-term exposure to PM2.5 has been linked to premature death, particularly in people with chronic heart or lung diseases, and reduced lung function growth in children.
Overall, while Hamilton's air quality is generally considered good, the presence of particulate matter PM2.5 and PM10 in the air can still have adverse health effects on the city's residents, particularly those with pre-existing health conditions, children, and older adults.
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Hamilton's air pollution levels vary monthly, with June to December being the worst
Hamilton, a city in Ontario, Canada, has a population of about 536,000 people. It is heavily industrialized, with a significant presence in the manufacturing industry, particularly in metal production. As a result of its large and growing population, coupled with its status as an industrial hub, Hamilton is subject to several polluting factors. The leading sources of air pollution in Hamilton are vehicular fumes and emissions, as well as industrial activities.
The city's air quality is measured using the PM2.5 index, which tracks hazardous particulate matter that is 2.5 micrometers or less in diameter. In 2019, Hamilton recorded a PM2.5 average of 10.1 μg/m³, which was just shy of the World Health Organization's (WHO) target for perfect air quality. This reading placed Hamilton 11th out of all ranked cities in Canada and 2528th worldwide.
Interestingly, Hamilton's air pollution levels vary monthly, with specific periods experiencing higher levels of pollution. Notably, the months of June and July tend to see an increase in PM2.5 levels. For instance, in 2019, the PM2.5 count rose from 9.8 μg/m³ in May to 12 μg/m³ in June and 13.7 μg/m³ in July. The end of the year also typically sees a rise in pollution levels, with November and December registering moderate to higher pollution readings. Indeed, December is often the most polluted month in Hamilton.
In contrast, the period from August to October usually experiences lower pollution levels, with October being the cleanest month in 2019, recording a PM2.5 reading of 7 μg/m³. However, it is important to note that Hamilton is subject to some ambient year-round pollution, with various pollutants in its air arising from vehicles, factory emissions, and the burning of organic materials.
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Frequently asked questions
In 2019, Hamilton placed 11th out of all cities ranked in Canada for air pollution. This placed it 2528th out of all cities worldwide.
The leading causes of air pollution in Hamilton are vehicular fumes and emissions, industrial emissions, and the burning of organic material.
Air pollution in Hamilton has been linked to respiratory and cardiovascular issues. One researcher stated that breathing the air in parts of Hamilton is like smoking a cigarette a day.
