Increased air pollution exposure during midlife may harm brain health as we age
A groundbreaking study led by researchers from the Institute of Psychiatry, Psychology & Neuroscience (IoPPN) at King’s College London has shed light on the detrimental effects of air pollution on brain health. The study, published in The Lancet Healthy Longevity, reveals that exposure to higher levels of air pollution during midlife is associated with slower processing speed, lower cognitive scores, and structural differences in the brain later in life.
The research, conducted in collaboration with University College London (UCL), University of Leicester, and Alzheimer’s Research UK (ARUK), highlights the link between air pollution and cognitive decline as individuals age. The findings suggest that even small reductions in air pollution levels could potentially preserve cognition and brain structure in older adults.
The study analyzed health survey data from 1,761 participants aged 45 and over who had taken part in the Medical Research Council’s National Survey of Health and Development. The researchers assessed participants’ cognitive abilities at various stages of their lives and conducted neuroimaging studies to gain a comprehensive understanding of the impact of air pollution on brain health.
The results of the study revealed that participants exposed to higher levels of air pollutants experienced lower scores on cognitive screening tests, particularly in attention, memory, verbal fluency, language, and perception. Additionally, those exposed to high levels of nitrogen dioxide (NO2) and particulate matter (PM10) exhibited slower processing speeds over time.
The neuroimaging substudy further confirmed these findings, showing that exposure to pollutants like NOx, NO2, and PM10 was associated with changes in brain structure, including smaller hippocampal volume and larger ventricular volume. These structural alterations are known to be linked with cognitive impairment and dementia.
Professor Ioannis Bakolis, one of the researchers involved in the study, emphasized the urgency of addressing air pollution as a public health concern. With an estimated 153 million people projected to be living with dementia by 2050, reducing exposure to air pollution could play a significant role in mitigating cognitive decline in aging populations.
Thomas Canning, a lead author of the study, highlighted the long-term implications of air pollution on brain health and stressed the importance of reducing exposure to preserve cognitive function and brain structure as individuals age. The study’s findings underscore the critical need for environmental policies and public health interventions aimed at improving air quality and protecting brain health.
In conclusion, this groundbreaking research provides valuable insights into the detrimental effects of air pollution on cognitive function and brain health. By raising awareness of the link between air pollution and cognitive decline, researchers hope to drive policy changes that prioritize clean air and promote healthy aging for future generations.
