Boston Zoning Commission Chair Michael Nichols, who heads a downtown advocacy group, said he plans to recuse himself from Wednesday’s vote on a contentious zoning plan that would clear the way for more skyscrapers downtown.

Nichols, president of the Downtown Boston Alliance, said that although he was cleared by the state Ethics Commission to take part in the vote, he ultimately opted not to weigh in on the zoning changes proposed in PLAN: Downtown in his official capacity as chair of the Zoning Commission.

“I was able to get a state ethics opinion that held that I do not actually have any conflicts tomorrow that run afoul of state law, but I nonetheless don’t want it to be a distraction — so I’m opting not to participate,” Nichols told the Herald Tuesday.

Nichols said he sought the ethi

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