Limitations of this study include a small and selected sample which might reflect more severe asthma phenotypes, and thus, our results may not be representative for a non-selected pediatric asthma population. Global Lung Initiative (GLI) reference equations were used to calculate spirometry measurements (FEV1, FVC, and FEV1/FVC ratio percent of predicted value [% predicted]). The investigation of potential long-term effects on FVC growth as a result of repeated exposure to bushfire requires further studies. While bushfires have long been a part of Australia's ecosystem, the 2019-20 bushfires were an unprecedented event leading to 5.5 million hectares of land being affected in New South Wales (NSW) alone.1 This is approximately the same as the area burnt in the combined bushfire seasons of 1993-94 and 2018-19.2 Air pollution has been recognized as a risk factor for asthma development.3 An increase in emergency department visits and hospital admissions has been described in asthmatic children exposed to bushfire smoke.4 Bushfire smoke contains a complex range of gases and particles, including a particulate matter measuring less than 2.5 microns (PM SB 2.5 sb ) composition, carbon monoxide, ozone, methane, and nitrogen oxides which is different from the one emitted by fossil fuel combustion.5 The NSW Air Quality Monitoring Network reported that 74% of the spring and summer days in 2019-20 met poor air quality standards according to the Air Quality Index.6 This study therefore aimed to determine the effects of bushfire smoke exposure during the 2019-20 bushfire season on lung function in asthmatic children. [Extracted from the article]