Abstract
Abstract Air pollution (AP) is a significant environmental risk to human health. Historically, the impact of AP exposure has focused upon the physical health effects, yet the implications of AP on mental health have received limited attention. Despite this, recent research has highlighted emerging evidence supporting a possible aetiological link. The purpose of this study, therefore, was to investigate the potential consequences of AP upon mental health and well-being. In a PRISMA based systematic review multiple databases were searched from January 2012 to 2022 for peer-reviewed, English-language, human based primary research. Of the 2,224 studies identified in the literature search, 94 met the inclusion criteria. The mental health and wellbeing issues explored were psychosis, anxiety, suicide, mania, overall diagnosed conditions, and self-reported wellbeing symptoms. Depression was omitted due to the volume of attention the condition has received in the literature. Key air pollutants, particulate matter (PM10 and PM2.5), sulphur oxides (SOx), carbon monoxide (CO) and nitrogen oxides (NOx) were investigated. Data revealed a positive association between psychotic disorders and NOx exposure in ten studies with only one contradictory finding. Whereas the other conditions received multiple contradictory findings. To compare these results to real-life situations, currently a pilot study is exploring associations between psychotic disorder diagnoses and AP, specifically NOx, in Wales using the Secure Anonymised Information Linkage (SAIL) database. There is a large body of evidence showing associations between mental health and AP. However, due to research complexities and some contradictory findings more high-quality research is required to elucidate these relationships.
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