Poor air quality is associated with poor health. Little attention is given to the complex array of environmental exposures and air pollutants that affect mental health during the life course.

We gather interdisciplinary expertise and knowledge across the air pollution and mental health fields. We seek to propose future research priorities and how to address them.

Through a rapid narrative review, we summarise the key scientific findings, knowledge gaps and methodological challenges.

There is emerging evidence of associations between poor air quality, both indoors and outdoors, and poor mental health more generally, as well as specific mental disorders. Furthermore, pre-existing long-term conditions appear to deteriorate, requiring more healthcare. Evidence of critical periods for exposure among children and adolescents highlights the need for more longitudinal data as the basis of early preventive actions and policies. Particulate matter, including bioaerosols, are implicated, but form part of a complex exposome influenced by geography, deprivation, socioeconomic conditions and biological and individual vulnerabilities. Critical knowledge gaps need to be addressed to design interventions for mitigation and prevention, reflecting ever-changing sources of air pollution. The evidence base can inform and motivate multi-sector and interdisciplinary efforts of researchers, practitioners, policy makers, industry, community groups and campaigners to take informed action.

There are knowledge gaps and a need for more research, for example, around bioaerosols exposure, indoor and outdoor pollution, urban design and impact on mental health over the life course.

Social connection is often impacted by acquired brain injury (ABI), contributing to isolation and compromised mental health. Group therapy is thought useful in this context. For those experiencing cognitive communication challenges, finding alternative ways to engage is also valuable. Art therapy may offer pro-social support through shared activity, self-expression, organic subject matter and enduring visual prompts.

A multiple A-B-A single case experimental design compared participation in sports discussion and art therapy groups on a long-stay secure unit. Nine individuals with ABI and complex combinations of communication, cognitive and mental health needs were studied. It was hypothesised that for some individuals, participation would be greater in art therapy than sports discussion groups.

Results from six individuals with at least five measurement points per phase are reported. Tau statistics revealed significant interphase differences for three individuals. Significantly less participation was recorded for two individuals in art than sports discussion, however they still appeared invested in the art groups. The remaining participant, with the most severe communication difficulties, avoided all baseline sports discussion groups, but participated in almost all art groups, with significant increase between initial sports discussion and art phases.

Further research is warranted regarding the potential art therapy offers for group engagement, particularly where complex challenges render traditional talking-style groups less appropriate. Furthermore, disparate and complex needs in severe ABI require diverse, well-designed groups offering different opportunities and responding to individual strengths and motivations. More research into such approaches may increase group participation in this challenging cohort.

Subjective cognitive difficulties are common in mental illness and have a negative impact on role functioning. Little is understood about subjective cognition and the longitudinal relationship with depression and anxiety symptoms in young people.

To examine the relationship between changes in levels of depression and anxiety and changes in subjective cognitive functioning over 3 months in help-seeking youth.

This was a cohort study of 656 youth aged 12–25 years attending Australian headspace primary mental health services. Subjective changes in cognitive functioning (rated as better, same, worse) reported after 3 months of treatment was assessed using the Neuropsychological Symptom Self-Report. Multivariate multinomial logistic regression analysis was conducted to evaluate the impact of baseline levels of and changes in depression (nine-item Patient Health Questionnaire; PHQ9) and anxiety symptoms (seven-item Generalised Anxiety Disorder scale; GAD7) on changes in subjective cognitive function at follow-up while controlling for covariates.

With a one-point reduction in PHQ9 at follow-up, there was an estimated 11–18% increase in ratings of better subjective cognitive functioning at follow-up, relative to stable cognitive functioning. A one-point increase in PHQ9 from baseline to follow-up was associated with 7–14% increase in ratings of worse subjective cognitive functioning over 3 months, relative to stable cognitive functioning. A similar attenuated pattern of findings was observed for the GAD7.

A clear association exists between subjective cognitive functioning outcomes and changes in self-reported severity of affective symptoms in young people over the first 3 months of treatment. Understanding the timing and mechanisms of these associations is needed to tailor treatment.