Growing evidence suggests that exposure to pollution may play a role in the development of mental health disorders, according to a briefing released on 3 March by the European Environment Agency (EEA). The report reviews current scientific research examining how air pollution, environmental noise and certain chemicals are associated with conditions such as depression, anxiety and schizophrenia.
Mental health disorders arise from a complex combination of factors, including genetics, social and economic circumstances, lifestyle and psychological influences. Researchers are increasingly examining pollution as an additional element that may contribute to these conditions. While scientists say more research is required to determine a direct cause-and-effect relationship, the existing body of studies points to consistent links between environmental exposures and mental wellbeing.
The findings come at a time when mental health problems have become more widespread across Europe. Over the past 25 years, the prevalence and incidence of mental health disorders have increased significantly. In 2023, such disorders represented the sixth largest burden of disease in the European Union (EU) and were the eighth most common cause of death.
Air pollution, noise and chemicals
Air pollution is one of the environmental factors receiving particular attention. Scientific studies cited in the EEA briefing indicate that exposure to polluted air during critical stages of brain development – including pregnancy, childhood and early adolescence – is associated with structural and functional changes in the brain. Long-term exposure to poor air quality, especially fine particulate matter (PM₂.₅) and nitrogen dioxide (NO₂), has been linked to a higher prevalence of depression and an increased risk of developing the disorder. Short-term spikes in pollution levels have also been associated with worsening symptoms in people living with schizophrenia.
Environmental noise is another factor examined in the report. Researchers have observed that increasing levels of road-traffic noise correspond with a small rise in the likelihood of depression and anxiety, estimated at around 3% and 2% respectively. Noise exposure has also been associated with behavioural problems among children, which can affect mental wellbeing. The briefing notes additional findings connecting railway and aircraft noise to mental health risks. Suicide rates were found to increase by 2.2% for every 10-decibel rise in railway noise. A meta-analysis cited in the report identified a 12% increase in the risk of depression for each 10-decibel rise in aircraft noise measured through the day-evening-night indicator (Lden).
Chemical exposure represents a further area of concern. Research discussed in the briefing links prenatal or childhood exposure to lead (Pb) with depression and schizophrenia. Second-hand smoke has also been consistently associated with these conditions, particularly among children and pregnant women who may be more vulnerable to environmental risks. Other studies have found associations between prenatal exposure to bisphenol A (BPA) and the development of depression or anxiety during childhood.
Reducing pollution and expanding access to nature
EEA emphasises that additional scientific work is needed to clarify the mechanisms behind these relationships. However, the available evidence strengthens the case for continued efforts to reduce pollution levels across Europe.
According to the agency, policies already in place could play a role in addressing both environmental and mental health challenges. The EU Zero Pollution Action Plan aims to reduce pollution to levels no longer considered harmful to human health and ecosystems. Progress toward these goals could also contribute to improvements in mental wellbeing.
The briefing also points to the relevance of the One Health concept, which recognises the connections between environmental conditions and the health of people and animals. Measures aimed at reducing pollution are part of this broader perspective, but the agency notes that other environmental actions may also support mental health.
Nature-based approaches are among the strategies receiving increasing attention. Expanding access to green spaces such as parks, forests and gardens – as well as blue spaces such as rivers, lakes and coastal areas – can encourage physical activity and social interaction while supporting psychological wellbeing. Therapeutic practices connected to nature have developed in recent decades, including gardening programmes, outdoor exercise and forest-bathing activities.
The European Environment Agency says that reducing pollution while expanding access to natural environments could benefit millions of people across Europe. As research into the relationship between environmental conditions and mental health continues to grow, the findings suggest that environmental policy may also influence the wellbeing of communities across the region.
Article Source:
Press Release/Material by EEA
Featured image credit: Joseph Ashraf | Unsplash
