Policy context

Air pollution remains a leading environmental health risk for children. Fine particulate matter—specifically PM2.5 and PM10—can penetrate deep into the lungs, impairing respiratory development and heightening the risk of asthma and other chronic respiratory conditions¹. Gaseous pollutants such as nitrogen dioxide and ozone are also linked to increased asthma attacks and acute respiratory illness in children.²

Beyond immediate health effects, there is growing evidence that long‑term exposure to elevated pollution levels adversely impacts cognitive development and academic performance. Evidence shows that air pollution not only harms respiratory health but also affects learning outcomes, with studies finding that higher PM2.5 exposure is linked to reduced test scores among school-aged children .³ ⁴

 Monitoring average pollutant levels provides an essential early warning signal. It enables policymakers and communities to identify high-risk areas, guide public health interventions, and ultimately protect children’s respiratory health and learning potential.

Tracking the number of days when fine particulate matter (PM2.5) concentrations exceed typical thresholds is important for understanding acute exposure risks. High-pollution days in Australia often coincide with bushfires, dust storms, or traffic-related emissions, and these events are strongly associated with increased asthma attacks and respiratory difficulties in children.⁵ ⁶ ⁷ Research shows that exposure to repeated episodes of poor air quality, such as during the 2019–2020 Black Summer bushfires, contributed to increased hospitalisations and measurable declines in lung function among children.⁸ Monitoring PM2.5 exceedance days therefore provides an important tool for identifying when children are most at risk and for supporting early warning systems and public health responses.