# Evolutionary sex bias in cognitive response to new environmental risk factor - PM2.5

## TL;DR

This paper reviews how PM2.5 pollution affects cognitive function differently in men and women, especially in younger people.

## Contribution

It highlights age-dependent sex differences in cognitive vulnerability to PM2.5, distinct from Alzheimer’s disease patterns.

## Key findings

- PM2.5 exposure is linked to cognitive impairment but with lower dementia risk compared to APOEɛ4 gene variants.
- Sex differences in cognitive response to PM2.5 are influenced by biological sex, hormones, and epigenetic regulation.
- These findings suggest the need for sex-specific public health strategies to address PM2.5-related cognitive decline.

## Abstract

The association between exposure to particulates in polluted air and cognitive impairment is an emerging and significant health concern, particularly among younger populations. Although exposure to particulate matter ≤ 2.5 μm (PM2.5) is linked with a lower estimated risk for dementia compared to traditional risk factors such as APOEɛ4 gene variants, the widespread and long-term population exposure to PM2.5 pose substantial implications for public health. This review explores the sex differences in cognitive function induced by PM2.5, which are age-dependent and distinct from the sex bias observed in Alzheimer’s disease. In addition to biological sex and sex hormones, we also discuss the role of epigenetic regulation as a mechanism underlying sex-specific cognitive vulnerabilities to environmental toxins, particularly PM2.5. Understanding these differences is important for developing targeted interventions and public health strategies to mitigate the cognitive impacts of PM2.5 exposure.