Meghan Hodges
The concept of air pollution has been recognised as a threat to human health since 400 BC, when Hippocrates wrote about it in 'On Airs, Waters and Places'. However, the mid-1700s marked the beginning of a significant rise in air pollution levels, coinciding with the Industrial Revolution. This period witnessed an increase in coal combustion, particularly in developing cities, which led to a substantial rise in emissions of primary pollutants such as SO2, NO2, NH3, and smoke. The Industrial Revolution accelerated both the magnitude of emissions and the geographical spread, with Europe and North America dominating emissions and suffering the most adverse effects. The 20th century brought about sweeping advances in the identification, regulation, and control of air pollution, alongside some of the most disastrous air pollution events, such as the Great Smog of London in 1952, which led to the UK's Clean Air Act in 1956.
| Characteristics | Values |
|---|---|
| Time period when air pollution was identified as a problem | 400 BCE |
| Time period when air pollution was identified as a threat to human health | 400 BCE |
| Time period when air pollution was recognised as a threat to the environment | 1975 |
| Time period when the first major international conference on air pollution was held | 1975 |
| Time period when the Clean Air Act Amendments were passed in the US | 1970 |
| Time period when the UK passed its first Clean Air Act | 1956 |
| Time period when the Great Smog of London happened | 1952 |
| Time period when the UK's capital was covered in lethal smog | 1952 |
| Time period when the Canada-US Air Quality Agreement was established | 1991 |
| Time period when the Harvard Six Cities study was conducted | 1993 |
| Time period when Asia emerged as the largest source of SO2 and NOx emissions | 2000s |
| Time period when there was a decline in SO2 and NOx emissions | 2010 |
| Time period when Beijing experienced extremely high levels of air pollution | 2012 |
| Time period when the Industrial Revolution began | mid-1700s to late 18th century |
| Time period when the Law of Nuisance was established in the UK | 1610 |
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What You'll Learn
The Industrial Revolution
The burning of coal, coupled with population growth, resulted in unprecedented levels of air pollution. This was exacerbated by the rise in domestic coal burning for heating and cooking, particularly in rapidly growing cities. The Industrial Revolution accelerated the magnitude of emissions of primary pollutants, with factories and engines playing a significant role. The expansion of global trade further contributed to the spread of air pollution across countries, making it a worldwide issue.
During the Industrial Revolution, cities became increasingly affected by poor air quality due to the concentration of emissions from factories and other industrial sources. This problem was particularly acute in large urban centres with high populations, such as London, which experienced the infamous Great Smog of 1952. This event highlighted the deadly consequences of air pollution, leading to the adoption of the Clean Air Act in the UK in 1956 to address pollution from coal burning.
The consequences of the Industrial Revolution on air quality extended beyond the immediate geographical locations of the industries. The release of pollutants into the atmosphere contributed to global warming, a phenomenon characterized by rising air and ocean temperatures due to increased greenhouse gas emissions. This "greenhouse effect" has far-reaching implications for the planet and all life forms that depend on a stable climate.
While the Industrial Revolution brought about significant advancements, it also had unintended consequences for the environment, particularly air quality. The burning of fossil fuels and the release of pollutants on a massive scale during this period set the stage for the air pollution challenges that persist to this day, with ongoing efforts to mitigate and address these issues.
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Urbanisation and population growth
The expansion of cities and the rise in industrial activities during the Industrial Revolution had a significant impact on air quality. As cities grew, the number of domestic emissions increased, with private households burning coal for heating and cooking, adding to the pollution from factories. This trend was particularly notable in developing nations undergoing rapid industrialisation, such as India and Pakistan, which have since become some of the most polluted countries in the world. The growth of global megacities and economic expansion further contributed to the increased use of oil and coal, exacerbating air pollution levels.
The link between urbanisation and air pollution is evident in the concentration of emissions from various sources within cities. Tall buildings and geographical features such as mountains can trap pollutants, preventing their dispersion and leading to the formation of smog. This phenomenon is common in large cities, particularly those in economically developing nations with fewer regulations and limited access to cleaner fuels. However, it is important to note that economically developed nations also face air pollution challenges, as seen in Italy and Poland, which were listed as the European countries with the worst air quality in 2022.
Population growth has also played a significant role in the rise of air pollution. As the population increases, so does the demand for energy, transportation, and manufacturing. These sectors are major contributors to air pollution, with vehicles, power plants, and factories burning fossil fuels and releasing pollutants into the atmosphere. Additionally, population growth has led to increased construction, which can contribute to air pollution through the use of certain construction materials and the release of dust and other particles during building processes. The combination of urbanisation and population growth has resulted in a higher concentration of emissions and pollutants in specific areas, making air pollution a pressing concern in densely populated cities.
The impact of urbanisation and population growth on air pollution has been a growing concern, leading to the development of laws and regulations aimed at controlling and reducing pollution levels. The "Law of Nuisance", established as early as 1610, recognised the importance of clean air for wholesome habitation. More recently, the 1956 Clean Air Act in the UK and the 1970 Clean Air Act Amendments in the US were implemented to address pollution from industrial activities and establish air quality standards. These legislative efforts reflect a growing awareness of the health risks associated with air pollution and a commitment to improving air quality in urban areas.
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Coal combustion
The combustion of coal has been a significant contributor to air pollution since the Industrial Revolution. The increased use of coal as a fuel source during this period led to unprecedented levels of air pollution, particularly in developing urban areas. The burning of coal releases toxic airborne pollutants and heavy metals, including mercury, lead, cadmium, arsenic, and particulate matter, also known as soot. These emissions have been linked to various health issues, including respiratory infections, asthma, cardiovascular problems, and premature death.
In the 19th century, the Industrial Revolution brought about a transition to new manufacturing processes, including the increased use of steam and water power, which relied heavily on coal as a fuel source. This led to a rise in coal consumption and combustion, resulting in increased emissions of primary pollutants. The problem of coal smoke as a harmful pollutant was recognised even before the Industrial Revolution, with royalty in England during the 13th and 14th centuries fleeing London due to unendurable smoke from the burning of "sea coal".
The combustion of coal continues to be a major source of air pollution today, with coal-fired power plants emitting toxic pollutants into the atmosphere. In 2014, US coal power plants emitted 197,286 tons of small airborne particles (PM2.5), as well as significant amounts of lead, cadmium, arsenic, carbon monoxide, and volatile organic compounds. These emissions have severe environmental and public health impacts, including asthma, heart and lung ailments, neurological problems, and cancer.
While some pollution control technologies, such as scrubbers, have been effective in reducing emissions, the retirement of coal power plants and the transition to cleaner energy sources are necessary to significantly improve air quality and mitigate the impacts of climate change. Ceasing coal combustion has been predicted to significantly reduce most air pollutants worldwide, including sulfur dioxide, nitrogen oxides, and fine particulate matter.
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Twentieth-century disasters
The twentieth century witnessed several disasters stemming from air pollution, which had begun to rise due to the Industrial Revolution. The magnitude of emissions and the geographical spread of contributing countries accelerated, with highly polluted cities becoming a pressing issue. Here is a detailed overview of some significant twentieth-century disasters:
The Great Smog of London, 1952:
The Great Smog of 1952 in London was one of the most severe air pollution disasters in the city's history. For four days, a thick layer of lethal smog, primarily from coal combustion, blanketed the UK's capital. This event resulted in the premature deaths of an estimated 12,000 people, with 4,000 directly attributed to the smog and over 100,000 falling ill. The environmental catastrophe triggered a steep rise in respiratory infections and led to the adoption of the Clean Air Act in 1956 to tackle industrial air pollution.
Donora Smog Disaster, 1948:
The Donora Smog Disaster in Pennsylvania is another notable incident. In October 1948, a combination of contaminants, including sulfur dioxide and particulate matter, led to a smog episode that caused 22 deaths, hospitalized 600 people, and affected thousands more. This incident gained national attention and highlighted the deadly consequences of air pollution.
London "Killer Fog," 1952:
The same year as the Great Smog, London experienced another deadly episode known as the "Killer Fog." This event resulted in 600 deaths and further emphasized the urgent need to address air pollution issues.
Poza Rica Killer Smog, 1950:
In 1950, the Mexican city of Poza Rica was engulfed by a killer smog caused by gas fumes from an oil refinery. This disaster left 22 people dead and hospitalized hundreds more, mirroring the tragic consequences of air pollution seen in other parts of the world.
Los Angeles Smog, 1950:
Dr. Arie Haagen-Smit identified the causes of the smog in Los Angeles as the interaction of hydrocarbons from cars and oxides of nitrogen. This recognition brought attention to the role of automobile emissions in air pollution and their contribution to global warming.
Asian Megacities and Industrialization:
During the twentieth century, particularly in its latter half, several Asian countries experienced rapid economic growth and industrialization. This growth contributed to the rise of "megacities" and a surge in the use of oil and coal, further exacerbating air pollution levels and making countries like India and Pakistan the worst-affected regions globally.
The twentieth century was a pivotal period in recognizing and addressing the disasters caused by air pollution. These events prompted legislative changes, scientific investigations, and a growing environmental movement to mitigate the impact of pollutants on human health and the planet's ecosystems.
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Legislative and regulatory responses
Early Efforts:
- 1853 – While not a legislative response, novelist Charles Dickens's work "Bleak House" offered a vivid portrayal of London's air pollution, describing a "twilight world of smoke, shadows, and wraiths."
- 1863 – The Alkali Act was enacted in response to air pollution from Britain's chemical industry, aiming to reduce hydrogen chloride emissions during alkali production. This act established the Alkali Inspectorate as the first British pollution control agency.
- 1906 – Pittsburgh established smoke abatement ordinances and a smoke inspector's office, significantly reducing gross emissions. This led to similar initiatives in other cities.
- 1909 – Winter inversions and smoke accumulations in Glasgow, Scotland, resulted in the deaths of over 1,000 people, highlighting the urgent need for air quality improvements.
- 1911 – Dr. Harold Antoine Des Voeux coined the term "smog" to describe the combination of smoke and fog that contributed to the Glasgow incident.
Federal Legislation and the Clean Air Act:
- 1955 – The Air Pollution Control Act became the first federal legislation regarding air pollution in the United States. It authorized a research and training program with funding allocated to the U.S. Public Health Service.
- 1963 – The Clean Air Act was enacted, marking the first federal legislation with direct authority to control air pollution. It encouraged cooperative efforts between states, local governments, and the federal government to reduce air pollution.
- 1967 – The Air Quality Act was passed, empowering states and local governments to address their pollution issues, with federal intervention if necessary. This act also led to the creation of the California Air Resources Board (CARB), which has played a pivotal role in the state's air quality improvements.
- 1968 – The Motor Vehicle Air Pollution Control Act set the first federal vehicle emissions standards, with the 1968 models being the first to comply.
- 1970 – Major amendments to the Clean Air Act were passed unanimously in the Senate and with overwhelming support in the House of Representatives. These amendments significantly expanded the federal government's role in air pollution control and established the Environmental Protection Agency (EPA) to oversee its implementation.
- 1977 – The Clean Air Act Amendments further strengthened the legislation, adding provisions to protect areas with clean air and tightening rules around automobile emissions.
- 1990 – The Clean Air Act underwent another set of major amendments, substantially increasing the federal government's authority and responsibility. These amendments introduced new regulatory programs to address acid deposition (acid rain) and toxic air pollutants, while also enhancing enforcement powers.
- 2000s – The California Air Resources Board (CARB) took on the responsibility of monitoring and reducing greenhouse gas emissions contributing to climate change.
- 2007 – The U.S. Supreme Court affirmed the EPA's obligation to regulate carbon pollution, including emissions from cars and power plants, in Massachusetts v. EPA.
These legislative and regulatory responses have played a crucial role in addressing air pollution and continue to shape the ongoing efforts to improve air quality and protect public health.
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Frequently asked questions
Air pollution has been recognised as a threat to human health since 400 BC, when Hippocrates wrote about it in 'On Airs, Waters and Places'. However, the mid-1700s saw a significant rise in air pollution due to the Industrial Revolution, which increased coal consumption and combustion.
The Industrial Revolution led to the rise of mechanised factory systems, chemical manufacturing, iron production, and increased use of steam and water power. This resulted in a massive increase in emissions of primary pollutants like SO2, NO2, NH3, and smoke, particularly in Europe and North America.
The Industrial Revolution's impact on air pollution was not limited to Europe and North America. As global trade took off, air pollution became a harsh consequence of industrial growth worldwide. Countries like India and Pakistan underwent rapid industrialisation and urbanisation, becoming the world's worst countries for air quality.
