As the negative repercussions of environmental devastation, such as global warming and climate change, become more apparent, environmental consciousness is growing across the world, forcing nations to take steps to mitigate the damage. Thus, the current study assesses the effect of green investments, institutional quality, and political stability on air quality in the G-20 countries for the period 2004-2020. The stationarity of the variables was examined with the Pesaran (2007) CADF, the long-term relationship between the variables by Westerlund ( 2007), the long-run relationship coe cients with the MMQR method proposed by Machado & Silva (2019), and the causality relationship between the variables by Dumitrescu & Hurlin (2012) panel causality. The study ndings revealed that green nance investments, institutional quality and political stability increased the air quality, while total output and energy consumption decreased air quality. The panel causality reveals a unidirectional causality from green nance investments, total output, energy consumption and political stability to air quality, and a bidirectional causality between institutional quality and air quality. According to these ndings, it has been found that in the long term, green nance investments, total output, energy consumption, political stability, and institutional quality affect air quality. Based on these results, policies implications were proposed.