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Fine particulate matter air pollution

Fine particulate matter air pollution has been studied in 2 papers since 2023: 2 observational studies in people; 1 in the past year. The newest story, Nov 11, 2026: “Air pollution changed brain immune cell activity in mice”.

Exposure

2 papers study it6 findingsUpdated

1 new paper in 30 daysSee all 2 papers on fine particulate matter air pollution

At a glance

The findings reach people, from one lab or study. 2 independent labs in 1 country.

“long-term PM2.5 exposure and Alzheimer disease (AD) polygenic risk were both independently associated with higher risk of AD and related dementias (ADRD).”
Air pollution exposure interacts with Alzheimer’s genetic susceptibility to reshape microglial epigenomic and transcriptional programsJournal of neuroinflammation2026doi:10.1186/s12974-026-04118-1

None of its findings points the other way.

Mice and humans: a single group. Cells and worms or flies: nothing yet.

C, W, M, H: cells, worms or flies, mice, humans. Dark: independent labs found the same change there. Light: one lab or one study. Outline: nothing yet.

Labs are independent when their papers share no last author and no institution.

  • 2 independent labs in 1 country
  • Funders: Alzheimer's Association and 5 more
  • Humans2

What did studies of fine particulate matter air pollution find?

5

Studies of fine particulate matter air pollution measured 5 outcomes, among them amyloid burden, cognitive function and blood-brain barrier integrity.

Amyloid burden

upin mice1

1 study

  1. Fine particulate matter air pollution increases amyloid burden in mice (5xFAD mice compared with filtered air).

    “In 5xFAD mice it additionally increased amyloid burden.”

    Animals5xFAD mice compared with filtered airconcentrated ambient PM2.5brain20 weeks

    Air pollution changed brain immune cell activity in mice

    Journal of neuroinflammation

More on Amyloid burden

Cognitive function

downin mice1

1 study

  1. Fine particulate matter air pollution impairs cognitive function in mice (5xFAD mice and wild-type littermates compared with filtered air).

    “impaired postnatal hippocampal neurogenesis, and caused cognitive deficits.”

    Animals5xFAD mice and wild-type littermates compared with filtered airconcentrated ambient PM2.520 weeks

    Air pollution changed brain immune cell activity in mice

    Journal of neuroinflammation

Blood-brain barrier integrity

downin mice1

1 study

  1. Fine particulate matter air pollution impairs blood-brain barrier integrity in mice (5xFAD mice and wild-type littermates compared with filtered air).

    “PM2.5 exposure activated microglia, disrupted the blood-brain barrier”

    Animals5xFAD mice and wild-type littermates compared with filtered airconcentrated ambient PM2.5blood-brain barrier20 weeks

    Air pollution changed brain immune cell activity in mice

    Journal of neuroinflammation

Microglial activation

upin mice1

1 study

  1. Fine particulate matter air pollution increases microglial activation in mice (5xFAD mice and wild-type littermates compared with filtered air).

    “PM2.5 exposure activated microglia”

    Animals5xFAD mice and wild-type littermates compared with filtered airconcentrated ambient PM2.5brain20 weeks

    Air pollution changed brain immune cell activity in mice

    Journal of neuroinflammation

Incident dementia

no changein humans1HR 1.04

1 study

  1. Fine particulate matter air pollution was not clearly linked with incident dementia in humans (Free of dementia at baseline; fully adjusted models) (HR 1.04, 95% CI 0.98–1.11 per IQR).

    “higher levels of PM2.5 (per IQR) were not associated with increased risk of incident dementia”

    HumansFree of dementia at baseline; fully adjusted modelsPer IQR of PM2.5Mean follow-up, 10.2 yearsBothsn = 27,857

    Hypertension and Stroke as Mediators of Air Pollution Exposure and Incident Dementia

    JAMA network open

More on Incident dementia

What is fine particulate matter air pollution linked with?

1

Studies link fine particulate matter air pollution with Alzheimer's disease and related dementias.

Alzheimer's disease and related dementias

upin humans1

1 study

  1. Fine particulate matter air pollution is associated with Alzheimer's disease and related dementias in humans.

    “long-term PM2.5 exposure and Alzheimer disease (AD) polygenic risk were both independently associated with higher risk of AD and related dementias (ADRD).”

    Humanslong-termn = 475,325

    Air pollution changed brain immune cell activity in mice

    Journal of neuroinflammation

More on Alzheimer's disease and related dementias

Latest

Dec 2025: 0Jan 2026: 0Feb 2026: 0Mar 2026: 0Apr 2026: 0May 2026: 0Jun 2026: 0Jul 2026: 0Aug 2026: 0Sep 2026: 0Oct 2026: 0Nov 2026: 11 paper in 12 months
Journal of Neuroinflammation

Air pollution changed brain immune cell activity in mice

A 20-week mouse experiment found that genetic background shaped how brain immune cells responded to fine-particle air pollution.A 20-week mouse experiment found that genetic background shaped how brain immune cells responded to fine-particle air pollution.

Mouse studyMechanisms
Paper

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