Air Pollution and Dementia: What the Science Says and What Your Building Should Do About It

Air pollution is increasingly recognized as a potential risk factor for dementia. This guide reviews the current state of the science, key findings from recent research, and considerations for building owners and facility managers when evaluating indoor air filtration and occupant well-being.

The evidence linking air pollution to dementia has grown substantially in recent years. While research is ongoing, a growing number of studies suggest a meaningful association. For building owners, facility managers, and others responsible for indoor air quality, these findings may have important implications.

A July 2025 meta-analysis published in The Lancet Planetary Health reviewed 32 studies covering data from approximately 29 million people across multiple countries [1]. The analysis found that for every 10-microgram-per-cubic-meter increase in PM2.5 exposure, the relative dementia risk increased by 17 percent. Similarly, each 10 microgram per cubic meter increase in nitrogen dioxide (NO) exposure was associated with a 3 percent increase in risk [1].

These effect sizes are notable, particularly given the scale and scope of the underlying data. The meta-analysis is among the largest conducted on this topic, drawing on decades of longitudinal health records from the late 1980s through the early 2020s.

A separate 2025 study published in Nature Aging applied a Burden of Proof meta-analytic framework to 28 longitudinal cohort studies. It is estimated that long-term exposure to PM2.5...

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