Why might the instantaneous environmental disruption from a solid rocket burn be considered the most aggressive of common propulsion types?

Answer

Due to the acute chemical payload, including chlorine compounds that catalyze ozone destruction

The acute chemical payload, particularly the chlorine released from solid propellants, presents a more aggressive, chemistry-altering pollution event than the pure $ ext{CO}_2/ ext{H}_2 ext{O}$ outputs of liquid engines.

Why might the instantaneous environmental disruption from a solid rocket burn be considered the most aggressive of common propulsion types?
propulsionrocket fuelcombustionemissions