I don't want to imply that there is no pollution in French Polynessia as there is plenty. Just look at the destruction of coral reefs
on many of the islands to build roads with crushed coral
bases. Drive around any island and you will see beach quarries with heavy equipment
on a quay loading dump trucks with ancient coral to be processed. Many believe that ciguatera came only after the practice of mining coral for road and runway development began.
As far as the Quay goes in Papeete I'm sure there is plenty of pollution but I doubt it is from the city dumping sewage in the inner harbor. It is a small harbor with plenty of commercial
boats tied up across from the quay, maybe they dump at night. Early morning car fumes are lousy at the quay until the trades kick in.
But still it is a great place to sail to as there is no other place like it in the S. Pacific. If you are going to sail half way around the world experience it all. Papeete is a city with a totally unique culture and should be enjoyed for what it is.
My first time there was in 1972 and let me tell you the city has changed. In those days Quinns bar was the most famous bar in the S. Pacific and if you dared to step inside the door you were willing to brawl with some very big guys, big women and some very big inbetweens. At night the main street was the only street one ventured on. The French were doing Nuke testing out in the atolls and every day the locals had protest marches in Papeete. I remember getting surrounded by some big brothers while a march was going on they wanted to know if I was French. When I showed them I was not they forcefully invited me to join the March and I did. I think that period was the first time that the French Foriegn legion was called into the island to stop the mugging of French Nationals.