FFF,
HWD, I don't think that's true, because you never get closer to the horizon, only to the coast. I think boomerangben's and bar shaker's theory sounds more plausible.....
Well actually, my brief explanation isn't incompatible with Bar Shakers. He is saying exactly the same thig, the viz over the land is less than over the sea. He just provides a reason for it.
Although our conclusions are the same, my reasoning isn't. Visibility over the sea will be better than over the land where the particals trapped in the air will be more dense where the prevailing wind is landward (as it is in your neck of the woods) in addition to the costal sea breeze (this time of year). Therefore, it wouldn't be wreckless to say that possibly the collection of haze inducing partials is less dense over the sea.
I think I understand that Bar Shaker's comment is referring to the condensation of moisture. The sea breeze is created by the convecting air over the land being replaced by cold (relatively) sea air. This sea air will only get warmer as it comes in over the hot land, reducing RH, not increasing it. Furthermore, that warming sea air will convect (it can't convect if it is cold, unless due to high ground) and will be taken back out to sea to cool. As the convecting air cools as it assends it flops over the top and back toward the sea. This condensation can sometimes be seen as a line of 'roll' cloud along the coast. As my understanding stands at this present time, I don't believe it would result in the effect you describe.
I wonder if the sea breeze process also effectively traps haze particals ove r the land?