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The pollution levels resulting from rockets varies. Some rockets use hydrogen and oxygen to reach orbit, meaning their exhaust is merely water vapor. Solid fuels produce more pollutants. Additionally, some rockets burn rocket-grade kerosine, hydrazine, and nitrogen tetroxide do not burn very clean. Some rockets burn nitrous oxide and high-grade rubber, which does not burn clean. While the exhaust does not burn clean, the infrequency of it's use results in a negligible environmental impact. Additionally, much of the exhaust is also released high enough to not enter the atmosphere.

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