Rising rocket launch frequencies, driven by expanding satellite constellations, threaten to slow the recovery of the Earth's ozone layer. Research indicates that approximately 2,000 annual launches—a 10-fold increase from 2024 levels—could cause 3% ozone thinning, primarily due to solid rocket motor chlorine and black carbon soot emissions.
Phys.org
Phys.org
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Ozone Depletion and Launch Impacts
Key Pollutants: Rocket engines emit chlorine gas and black carbon soot directly into the stratosphere, which destroys ozone molecules.
Impacted Regions: Studies show that while most launches occur in the Northern Hemisphere, the largest ozone losses are predicted over Antarctica due to atmospheric transport.
Recovery Delay: While the ozone layer is healing from CFC damage, increasing rocket emissions could delay this recovery by years or decades.
Fuel Types: Rocket propellant choices differ significantly in impact. Solid rocket motors are the primary source of chlorine, whereas hydrocarbon-fueled rockets release substantial black carbon.
Future Scenarios: An "ambitious" scenario of 2,040 launches per year by 2030 could lead to a
decline in global annual-mean total column ozone, while a "conservative" scenario of 884 launches would cause a
decline.
PubMed Central (PMC) (.gov)
PubMed Central (PMC) (.gov)
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Mitigation and Regulation
Unregulated Industry: Rocket emissions are currently unregulated internationally, making them a growing, unchecked concern.
Solutions: Experts suggest reducing the use of chlorine-containing fuels and minimizing soot from rocket exhaust to protect the atmosphere.
Growth Concerns: While the space industry is booming, experts warn that the environmental impacts must be managed to ensure sustainability.