China has made progress in improving air quality, but current levels of air pollution still have great health impacts. Dr Qiang Zhang, an atmospheric chemist at Tsinghua University, speaks to Nature Geoscience about air pollution control in China, and the challenges and opportunities faced under global environmental change.

India is currently one of the most polluted regions in the world. Dr Chandra Venkataraman, an expert in climate change and air pollution at the Indian Institute of Technology Bombay, speaks to Nature Geoscience about challenges and opportunities facing air pollution control in India.

The United States currently has modest levels of air pollution after decades of clean air actions. Dr Colette Heald, an atmospheric chemist at the Massachusetts Institute of Technology, speaks to Nature Geoscience about air pollution control in the US, and the challenges and opportunities faced under global environmental change.

Air pollution is a leading cause of death globally. Efforts to clean the air will not only save lives but contribute to addressing broader environmental and socioeconomic challenges.

Sample return missions to asteroids provide critical pristine materials lacking from meteorite collections.

replying to R. J. Walker et al. Nature Geoscience https://doi.org/10.1038/s41561-023-01268-2 (2023)