Diesel fumes may harm sense of smell and brain health, study suggests
NCT ID NCT07237958
First seen Nov 20, 2025 · Last updated Jun 22, 2026 · Updated 27 times
Summary
This study tested 40 healthy adults to see if breathing diesel exhaust changes the nose's olfactory system and thinking ability. Participants were exposed to both diesel exhaust and clean air in random order. Researchers took nose tissue samples and ran smell and cognitive tests. The goal is to understand how air pollution might raise dementia risk.
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This is a summary of
the original study
.
Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Locations
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Umeå Univeristy
Umeå, 90185, Sweden
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Diesel exhaust particles
What this could lead to
If successful, this could help explain how air pollution might contribute to dementia, pointing toward preventive strategies.
What could go wrong
This is a small, early-stage study in healthy people, not patients. It only looks at short-term effects, so it may not reflect real-world long-term risks.
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.