Kerosene and oxygen.. Anyway it's probably that the exhaust plume will contain reactive species like nitrogen oxides, maybe the water vapour could have a role.

Kerosene and oxygen.. Anyway it's probably that the exhaust plume will contain reactive species like nitrogen oxides, maybe the water vapour could have a role. It's not a big effect. Hydrazine powered rockets have a much bigger effect (all those nitrogen oxides) and are still not a very big deal.