2 stroke vs 4 stroke..which one produces less exhaust fumes?

Question

Would a 2 stroke engine with an exhaust catalyzer be better for the environment than a 4 stroke engine of the (same displacement) without one?

Answer 1

4 stroke produces less fumes as less combustion takes place in the same amount of revolutions, whereas 2 stroke is combusting twice as much, using twice as much fuel, producing twice the fumes but giving twice the power.