Meghan Hodges
Despite decades of progress in reducing air pollution, there are signs that this trend may be slowing down. Research shows that the gains in air quality that were made in the 1980s and 1990s are not progressing as quickly as previously thought, with air pollution still contributing to one in every 25 early deaths. This is a global issue, with improvements in air quality across Europe also coming to a near halt and climate change expected to further reduce air quality. While some studies suggest that severe pollution is slowing down warming in major cities, this is likely only temporary, and the protection comes from harmful pollutants.
| Characteristics | Values |
|---|---|
| Progress in fighting air pollution | Slowing down |
| Air pollution trends in the US | Improving but slowing down |
| Air pollution trends in Europe | Improving but slowing down |
| Impact of COVID-19 pandemic on emissions | Drop in emissions but not enough to slow climate change |
| Relationship between population density and pollution | No direct relationship |
| Impact of climate change on time | May be slowing it down |
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What You'll Learn
Air pollution and deaths
Air pollution is a major threat to public health, causing respiratory and other diseases. It is caused by the presence of chemical, physical, or biological pollutants in the air, such as particulate matter, carbon monoxide, ozone, nitrogen dioxide, and sulfur dioxide. According to the World Health Organization (WHO), air pollution kills an estimated 7 million people worldwide every year, with 4.2 million deaths attributed to outdoor air pollution and 3.8 million to indoor air pollution from burning wood and charcoal. However, some scientists believe the number could be even higher, with estimates ranging from 8 million to 9 million deaths annually.
The impact of air pollution on human health is significant, and it has become the second leading global risk factor for death, surpassing tobacco and poor diet. In 2021, air pollution accounted for 8.1 million deaths globally, including 700,000 deaths of children under five years old. The majority of these child deaths were linked to household air pollution due to the use of polluting fuels for cooking, predominantly in Africa and Asia.
The sources of air pollution are diverse and context-specific, including residential energy use for cooking and heating, vehicles, power generation, agriculture, waste incineration, and industrial activities. Fine particulate matter, known as PM2.5, is of particular concern as it can penetrate deep into the lungs and enter the bloodstream, increasing the risk of various non-communicable diseases such as heart disease, stroke, diabetes, lung cancer, and chronic obstructive pulmonary disease (COPD). Exposure to ozone is also a significant contributor to air pollution-related deaths, with an estimated 489,518 deaths globally attributed to ozone in 2021.
While there have been efforts to improve air quality, progress appears to be slowing down. In the United States, for example, there were more days of polluted air in 2018 compared to the previous five years, and particulate matter pollution has shown a recent upward trend. Similarly, in Europe, progress in improving air quality has almost come to a halt, with minor improvements in NO2 emissions but persistent issues with fine particulate matter concentrations (PM2.5). The COVID-19 pandemic resulted in a drop in emissions due to shelter-in-place measures, but this reduction was not significant enough to slow climate change or air pollution in the long term.
Despite the grim reality of air pollution and its impact on deaths worldwide, there is some hope. The total number of deaths from air pollution globally has remained relatively stable over the years, indicating that the death rate from air pollution has been declining. With the implementation of policies and investments that support sustainable practices, cleaner energy sources, and improved air quality standards, there is a potential to significantly reduce air pollution and its impact on human health.
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Europe's pollution levels
While air pollution in Europe has been declining, it still poses a significant risk to human health and the environment. According to the European Environment Agency, air pollution across Europe is decreasing, yet 94% of urban residents are exposed to fine particulate matter (PM2.5) above the World Health Organization's (WHO) recommended levels. This pollutant is the most harmful to human health and is linked to asthma, heart disease, lung cancer, and stroke. Lower socio-economic groups tend to be exposed to higher pollution levels, while older people, children, and those with pre-existing health conditions are more vulnerable. Over 1,200 deaths in people under 18 years old are attributed to air pollution annually in EEA member and collaborating countries. Central and Eastern European countries and Italy reported the highest levels of particulate matter due to the burning of solid fuels for heating and industrial use.
In 2019, several EU countries lost more than 5% of their wheat yield due to ground-level ozone (O3), which also damages agricultural crops and forests, affecting biodiversity and ecosystem services. In 2020, 75% of the EU's ecosystems were exposed to excessive nitrogen levels, leading to eutrophication. While air pollution in Europe has generally decreased, some countries have faced criticism and legal action for exceeding pollution limits. The European Court of Justice (ECJ) found that France had breached pollution limits since 2010 and warned Bulgaria and Poland about possible fines. Germany, Hungary, Italy, Romania, and the UK also face legal action for high levels of NO2 and PM2.5.
The progress in improving air quality across Europe has slowed down, according to the EEA. While there have been minor improvements in NO2 emissions, overall levels remain problematic. The biggest concern is the concentration of fine particles (PM2.5), which steadily decreased between 2000 and 2014 but has not improved since. This stagnation in progress is attributed partly to the refusal of carmakers to transition to cleaner fleets. The COVID-19 pandemic resulted in a drop in emissions, but this decrease was not significant enough to slow climate change or improve air quality in the long term.
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US air quality improvements
The US has made significant progress in improving air quality over the decades. Emission regulations and clean air technologies have helped reduce the days of smog and have led to overall improvements in air quality. According to the EPA, between 1970 and 2020, the combined emissions of six common pollutants (PM2.5, PM10, SO2, NOx, VOCs, CO, and Pb) dropped by 78%. This progress in emission reduction has resulted in dramatic improvements in the air quality that Americans breathe.
Clean Air Act programs have played a crucial role in lowering the levels of these common pollutants, including particles, ozone, lead, carbon monoxide, nitrogen dioxide, and sulfur dioxide. The permanent phase-out of leaded gasoline and controls on emissions of lead compounds through EPA's air toxics program have been particularly effective, with airborne lead concentrations decreasing by 98% between 1980 and 2005.
Additionally, the EPA's peer-reviewed 2011 study found that clean air programs established by the 1990 CAA amendments are expected to yield direct benefits that far exceed compliance costs. These benefits include improvements in public health, with MATS (a technology to reduce toxic pollution) estimated to prevent thousands of premature deaths, heart attacks, and asthma attacks annually. The quantified air quality improvements from MATS for people's health alone total $37 billion to $90 billion each year.
However, there are signs that this positive trend in air quality improvements may be slowing down or even reversing. A report by the American Lung Association found that between 2015 and 2017, more cities experienced days of highly polluted air compared to the previous two years. Another study by Carnegie Mellon University researchers concluded that while particulate matter pollution decreased by 24% nationwide from 2009 to 2016, it increased by 5% from 2016 to 2018. The increase in air pollution between 2016 and 2018 was associated with 9,700 additional premature deaths.
Factors contributing to the decline in air quality include increased economic activity, reduced enforcement of environmental regulations, and wildfires. While addressing climate change can help improve air quality, the current policy direction may hinder progress. Moving forward, adopting policies that prioritize emission reductions and clean energy transitions will be crucial for improving and maintaining air quality in the US.
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Population density and pollution
There is evidence that progress in improving air quality is slowing down. For instance, in 2021, the European Environment Agency (EEA) reported that progress in improving air quality across Europe had almost come to a complete stop. While there have been minor improvements in NO2 emissions, the biggest concern is fine particle concentrations (PM2.5), which reduced steadily between 2000 and 2014 but have not decreased since. This has been reflected in the US as well, where decades of air quality improvements may be slowing, with more cities suffering from days of highly polluted air in recent years.
Population density has been identified as a significant factor contributing to air pollution, particularly in urban areas. Research has shown that denser locations are associated with higher concentrations of PM2.5, a measure of fine particulate matter like dust and soot that can negatively impact human health. This challenges the conventional wisdom that more compact cities are greener, as increased density can lead to higher pollution concentrations and associated health risks. For example, in the San Joaquin Valley, USA, population-weighted concentrations of PM2.5 were found to be higher in medium- to high-density growth scenarios, particularly in areas close to major transportation corridors.
The relationship between population density and pollution is complex and can be influenced by various factors, including urban planning and policy. For instance, the implementation of emission controls can help mitigate the impact of high-density growth on air quality. In the case of the San Joaquin Valley, it was estimated that a complete ban on wood burning and a significant reduction in emissions from food cooking operations and diesel engines could result in lower PM2.5 concentrations, even in medium- to high-density areas.
Additionally, the impact of population density on pollution may vary depending on the specific context and location. For example, while denser cities may have higher concentrations of PM2.5, they can also have lower greenhouse gas emissions due to improved efficiency and reduced reliance on car transportation. However, the overall impact of increased population density on air quality is a concern, especially in already densely populated cities.
To address the issue of pollution in densely populated areas, a combination of strategies may be necessary, including rigorous emissions controls, urban planning that considers pollution hotspots, and the implementation of clean technologies. By taking these steps, it may be possible to mitigate the negative impacts of population density on air quality and human health, even in highly urbanized areas.
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Climate change and time
Climate change is an ongoing concern, and the data shows that human activities, primarily through greenhouse gas emissions, have caused global warming. Since the pre-industrial era (1850-1900), the global average surface temperature has increased by approximately 2 degrees Fahrenheit (1 degree Celsius), and the rate of warming has accelerated in recent decades. This temperature increase represents a significant rise in the heat energy circulating throughout the Earth's systems, including the oceans, frozen landscapes, and the atmosphere.
The consequences of this warming are far-reaching. For instance, the decline of ice and snow in the Arctic reduces the reflection of incoming sunlight, amplifying the rate of warming. This feedback loop further intensifies the effects of climate change. According to the Intergovernmental Panel on Climate Change (IPCC), if current warming rates persist, global temperatures could rise by 1.5 degrees Celsius as early as 2030. To limit warming to this threshold, significant reductions in global CO2 emissions are necessary before 2030, with net-zero emissions targeted by around 2050.
In addition to the direct impacts on temperature, climate change is also influencing timekeeping. The rapid melting of polar ice sheets is shifting more mass towards the Earth's waistline, slowing the planet's rotation and affecting our synchronization of clocks. This mass redistribution is causing a slight delay in the need for timekeeping adjustments, but the long-term trend indicates an inevitable shift towards losing time or modifying international timekeeping guidelines.
While addressing climate change is crucial, it is important to note that progress in improving air quality has slowed in recent years. Despite advancements in emission regulations and clean air technologies, air pollution still contributes to premature deaths. Fine particulate matter (PM2.5) caused 412,000 premature deaths in 2016, and levels have remained steady after years of reductions. Additionally, breaches of minimum air quality levels have been observed in several European countries, indicating a need for more effective policies and actions to combat air pollution.
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Frequently asked questions
No, pollution is not slowing down. In fact, it is getting worse. While there have been some improvements in air quality over the years, progress has slowed down significantly in recent times.
There has been an increase in the number of days with polluted air. A report by the American Lung Association found that between 2015 and 2017, more cities suffered from days of highly polluted air than between 2014 and 2016.
The health impacts of air pollution are significant. Air pollution contributes to one in every 25 early deaths. It can cause respiratory problems and increase inflammation, which can lead to chronic diseases such as heart disease and cancer.
One reason for the increase in pollution is additional pollutants from sources such as industrial, residential, and commercial boilers, as well as off-road vehicles. Another reason is the slower-than-expected reduction in emissions from heavy-duty diesel trucks.
To address the problem of increasing pollution, it is important to implement effective emission regulations and policies. This may include reducing emissions from vehicles and industrial sources, as well as adopting clean air technologies. Additionally, addressing climate change can also help improve air quality, as warmer temperatures contribute to the formation of ozone pollution.
