Heat waves are becoming more frequent around the world. And while rising temperatures caused by greenhouse gas emissions are part of the problem, the declining levels of aerosols—the small particles that make up smog and air pollution—may be driving the rise even more, particularly in populated areas.



Summary

Global heat waves are increasing in frequency. While greenhouse gas emissions contribute to rising temperatures, decreasing levels of aerosols, tiny particles forming smog and air pollution, may be a larger driver, especially in populated areas. Reduced air pollution, while beneficial for health, allows more sunlight to reach the surface, exacerbating heat. This suggests that cleaning up the air may have unintended consequences for heat waves, necessitating a comprehensive approach to address climate change and its impacts.

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