Why is rocket pollution considered uniquely impactful compared to conventional aircraft pollution?

Answer

Rocket exhaust is injected into altitudes (stratosphere/mesosphere) where chemical lifetimes are extended.

Rocket exhaust is injected directly into the stratosphere and mesosphere, altitudes where chemical lifetimes are significantly extended compared to conventional aircraft pollution that largely dissipates in the lower atmosphere.

Why is rocket pollution considered uniquely impactful compared to conventional aircraft pollution?
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