Diesel engines are ubiquitous in today’s world. They power our cars, buses, trains, ships, and aeroplanes. But how safe are they? According to a recent study, brief exposure to diesel exhaust can affect human brain function.
Diesel Exhaust: A Complex Mixture of Particles and Chemicals
Diesel engines burn a mixture of fuel and air to produce energy. However, unlike gasoline engines, which use a spark to ignite the fuel, diesel engines rely on compression to ignite the fuel. This results in the production of a complex mixture of particles and chemicals known as diesel exhaust.
Diesel exhaust consists of several components, including particulate matter (PM), nitrogen oxides (NOx), carbon monoxide (CO), and volatile organic compounds (VOCs). PM, made up of tiny particles of soot and other substances, is the most studied component of diesel exhaust.
PM is classified as a Group I carcinogen by the International Agency for Research on Cancer (IARC), meaning it is a substance that is known to cause cancer in humans. It is also a known respiratory hazard, with prolonged exposure causing lung cancer, chronic bronchitis, and other respiratory illnesses.
The Volkswagen scandal revealed that the company had intentionally installed software in its diesel engines to cheat emissions tests. The software allowed the engines to emit less pollution during testing than real-world driving. The scandal had far-reaching consequences. Volkswagen had to pay billions of dollars in fines and diesel claim compensation to customers who had purchased affected vehicles. The scandal also highlighted the harmful effects of diesel emissions on human health.
How Do Diesel Exhausts Affect the Brain?
While diesel exhaust’s respiratory and carcinogenic effects have been well-documented, its effects on the brain are less understood. Previous studies have shown that diesel exhaust can cause inflammation and oxidative stress in the brain, which can lead to neurodegenerative diseases such as Alzheimer’s and Parkinson’s.
The new study, however, provides the first direct evidence that brief exposure to diesel exhaust can impair cognitive function in healthy adults. Researchers from the University of British Columbia and the University of Victoria showed that even moderate levels of traffic pollution can profoundly impact the human brain. In just a matter of hours, exposure to typical levels of diesel exhaust has been found to decrease the brain’s functional connectivity.
In a controlled laboratory experiment, 25 adults were subjected to filtered air and diesel exhaust. The researchers used functional magnetic resonance imaging (fMRI) to measure brain activity before and after each session.
The study focused on the brain’s default mode network (DMN), which is involved in memory and internal thought processes. The fMRI results showed that after exposure to diesel exhaust, participants exhibited a significant decrease in functional connectivity within the DMN compared to when exposed to filtered air.
According to Elizabeth Bechard, a senior policy analyst at Moms Clean Air Force, the impact on children’s brain development is deeply concerning. This is significantly worrisome as 20 million children rely on diesel-fuelled buses for their daily school commute. Research has already shown that exposure to diesel exhaust can negatively affect children’s cognitive abilities and academic performance.
What Can Be Done to Reduce Diesel Emissions?
Reducing diesel emissions is crucial for protecting public health. Governments and businesses can take several steps to reduce emissions from diesel engines. First, governments can set and enforce strict emissions standards for diesel engines. In the European Union, for example, some regulations limit the amount of PM and NOx diesel engines emit. These regulations have been effective in reducing emissions from diesel engines.
Second, businesses can invest in cleaner technologies, such as electric or hybrid vehicles, which produce fewer emissions than diesel engines. Many companies are already doing this, recognising that investing in clean technologies is good for the environment and their business.
Finally, individuals can take action to reduce their exposure to diesel emissions. This can include walking, cycling, or taking public transportation instead of driving a car. It can also involve living in areas with less traffic or using air purifiers in their homes.
If they suspect their vehicles emit more emissions than what guidelines allow, they may opt for a diesel claim, a legal action brought against an automaker for producing and selling a car that exceeds legal emission limits. These claims are based on the principle of product liability, which holds that manufacturers are responsible for ensuring that their products are safe and perform as advertised. ClaimExperts.co.uk offers guidance on how to start the claims process.
The health impact of diesel emissions goes beyond the environment and affects public health, especially in urban areas with high pollution levels. The findings call for policies and regulations addressing the impact of diesel emissions on human health and more research on the link between air pollution and brain damage. The study reminds us that the cost of inaction on air pollution is too high and that we must act now to protect our health and planet.
