July 31, 2025Open Access

Air quality impacts of Stratospheric Aerosol Injections are small and mainly driven by changes in climate, not deposition

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Modeling reveals modest reduction in pollution-related mortality with stratospheric aerosol injection, highlighting climate implications.

SAI shows a small impact on mortality from pollution, with a 1.26% reduction in ozone-related deaths.
The study analyzed mortality linked to PM2.5 and ozone using CESM2-WACCM6 simulations across different scenarios.
Pollution-related mortality changes are complex and influenced more by climate than by sulfate aerosol injection amounts.
Results indicate that health implications of SAI are less significant compared to immediate benefits from air quality policies.

Wang et al. (2025) studied this question.

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