Air pollutant exposure linked to heightened risk of death by suicide/suicidal thoughts

Research reveals that exposure to certain air pollutants, such as PM2.5, PM10, and NO2, could elevate the risk of death by suicide, suicidal thoughts, and suicide attempts, according to a pooled data analysis of existing studies. The findings, published in the Journal of Epidemiology & Community Health, suggest that environmental exposures should be considered as potential modifiable risk factors in suicide prevention strategies.

Globally, over 720,000 people die by suicide annually, and the World Health Organization aims to reduce this number by at least a third between 2013 and 2030. While the impact of environmental exposures on mental health outcomes like depression and anxiety has been well-documented, their role in suicide risk is less understood. Researchers analyzed 45 studies published between 2010 and 2024, focusing on Air pollutants like PM2.5, PM10, and NO2, water pollution, noise pollution, and light pollution.

The pooled analysis found that short-term and long-term exposure to PM2.5 and PM10, as well as long-term exposure to PM2.5 and NO2, were significantly associated with increased risks of suicide-related outcomes. However, evidence for other pollutants, noise, water, and light exposure remained limited or inconsistent. The researchers emphasize the need to integrate environmental health into mental health policy through cross-sectoral collaboration, pollution reduction strategies, and targeted public health interventions to reduce suicide risk and improve overall population mental well-being.