A study recently presented in San Diego at The Gerontological Society
of America’s (GSA) 65th Annual Scientific Meeting, has linked a high
level of air pollution to cognitive decline, with data suggesting that
increased pollution levels could be ageing the brains of over-50s by up
to three years. In addition, previous research had also found that the
problems of pollution are connected to cardiovascular and respiratory
conditions such as asthma and COPD. This is because pollutants such as
cigarette smoke and car exhaust fumes emit gases and particles into the
atmosphere, causing irritation to the airways.
The latest research on air pollution was conducted by the US-based
National Institute on Aging, who analysed 14,793 men and women aged over
50. The scientists specifically looked at the results of cognitive
tests and correlated the results against geographical data of air
pollution. Participants were tested on knowledge, language, orientation
and word recall, being measured on a scale of 1 to 35.
As it currently stands, health experts
estimate that air pollution is already effecting the heart and lungs and
slashing the life expectancy of everybody living in the United Kingdom
by approximately seven to eight months.
The U.S. scientists were studying exactly how the particle matter
‘PM2.5’ affected health and well-being of the participants. PM2.5 is
released via dust, dirt, liquid droplets, soot and smoke. It is commonly
breathed in after being emitted by vehicle exhaust emissions, in
addition to gas boilers and heavy industry. The name PM2.5 stems from
the fact that the particles which are 2.5 micrometres in diameter or
smaller, are unfortunately small enough to be inhaled and deposit deep
inside the lungs and the brain.
In order to obtain accurate information, numerous factors were taken
into account such as age, race/ethnicity, education, smoking behaviour
and respiratory and cardiovascular conditions. It was determined that
exposure to fine air particulate matter ranged from 4.1 to 20.7
micrograms (mcg) per cubic metre, and for every extra 10 micrograms of
PM2.5 in a cubic metre of air (about the difference between inner London
and rural Britain), the decline of brain power in the study subjects
equated to roughly three years of ageing.
Dr Jennifer Ailshire, from the Andrus Gerontology Center at the
University of Southern California, carried out the analysing by
utilising data obtained from the American Environmental Protection
Agency and the Health and Retirement Study. Regarding the results of the
research, she said: “As a result of age-related declines in health and
functioning, older adults are particularly vulnerable to the hazards of
exposure to unhealthy air. Air pollution has been linked to increased
cardiovascular and respiratory problems, and even premature death, in
older populations, and there is emerging evidence that exposure to
particulate air pollution may have adverse effects on brain health and
functioning as well.”
Adding to Dr Ailshire’s comments was Professor Frank Kelly, a
professor of environmental health at King’s College London. He offered
his thoughts on the problem of air pollution and said: “The average
amount of this pollutant in London is around 13 to 15 mcg per cubic
metre, while in some rural areas away from traffic it can be as low as
three or four mcg. The research shows that living somewhere with clean
air means your will retain your brain power for a longer period of time
than if you live in an urban area. Here is another study showing that
the quality of the air that we breathe can not only affect for our heart
and lungs, but our brains as well.”
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