- Dr. Ana Rodriguez*
- Research Unit, Centre for the Study of Population, Economy, and Society, Porto, Portugal
- DOI: 10.5281/zenodo.19609383
Background: Atmospheric pollution is widely recognised as a
determinant of respiratory and cardiovascular morbidity; however, its
contribution to psychiatric burden remains underappreciated in both clinical
and regulatory contexts. This asymmetry in recognition risks may underestimate
the mental health toll of environmental hazard exposure.
Purpose: This commentary synthesises the available evidence
linking ambient air pollutant exposure primarily particulate matter (PM₂.₅,
PM₁₀) and nitrogen oxides to psychiatric outcomes including depression,
anxiety, psychological stress, and suicidal behaviour, and examines the
implications for clinical practice and environmental policy.
Evidence
summary: Reviewed studies
spanning longitudinal cohorts, quasi-experimental designs, systematic reviews,
and predictive modelling consistently demonstrate associations between air
pollution and psychiatric symptomatology across diverse populations. A
non-linear dose-response pattern is observed, with mental health risks emerging
at pollutant concentrations within or below established regulatory thresholds. Stress
response to inhaled pollutants with neuroendocrine activation including
hypothalamus-pituitary-adrenal axis and sympathetic-adrenal-medullary
stimulation offer a plausible mechanistic basis. Decontamination interventions
have shown prospective benefits on depressive burden.
Conclusions: The mental health burden associated with ambient
air pollution could be underestimated by current diagnostic frameworks and may
not be adequately prevented by existing air quality standards. Clinicians
should consider environmental exposures in the differential assessment of
psychiatric symptoms, and policymakers are urged to revise regulatory
thresholds to reflect the non-linear risk profiles identified for vulnerable
populations.
