A year ago, Mayor Bloomberg stood with City Council Speaker Gifford Miller beneath the Triborough Bridge at Astoria Park and said it was time to overhaul the city’s decades-old noise code. Yesterday, Mr. Bloomberg returned to the same spot to launch an uncharacteristically harsh attack on his Democratic political rival for failing to act.

Holding up a large color picture from the June 7, 2004, press conference, Mr. Bloomberg said: “For those of you who do not remember that event, let me refresh your memory. Here it is. Now, this is the mayor, and this is the speaker, and here are two city councilmen.”

He quoted Mr. Miller as calling the council “committed to the outcome” of the code reform and promising “extensive hearings.”

“Encouraging words, but unfortunately, they have not been matched by action,” Mr. Bloomberg said.

Mr. Bloomberg’s outburst, which amounted to the first individualized attack by the mayor on one of the Democratic candidates, came the morning after the four Democrats met for their first debate and spent the bulk of their time bashing the mayor. It also came less than two months after the mayor, exultant at the conclusion of negotiations over the budget for the current fiscal year, said: “Gifford Miller has been a great speaker of the City Council.”

He said he didn’t know what was motivating the council speaker to ignore a problem that prompts about 1,000 complaints a day from New Yorkers, but he said it was a “disgrace.” He speculated that Mr. Miller might be stalling on the noise code issue for political reasons.

“There are rumors that some people in the City Council have said they don’t want to give the administration any kind of victory in an election year,” Mr. Bloomberg said. “If that is the case, that’s a disgrace. This is the no. 1 complaint people have. In the last year, we’ve got over 410,000 people who’ve taken the trouble to call up and complain.”

Yesterday afternoon, when Mr. Miller learned of Mr. Bloomberg’s comments in Queens, the speaker said: “It’s a little hard to take somebody seriously who’s making political charges about politics at a political press conference.”

Not referring to Mr. Bloomberg by name, Mr. Miller said the administration has failed to answer the council’s questions and has prevented progress on a noise code. “This is an administration that has a pretty strong record of trying to write everybody a ticket for absolutely anything that they possibly can, and they’re not interested in having a reasonable standard,” Mr. Miller said, standing in the Red Room of City Hall. He said that with or without the mayor, the council would act on the noise issue in the fall.

A few hours later, Mr. Miller’s press office sent out another statement from the speaker, saying the mayor’s proposal, in its current form, would have allowed officers to ticket New Yorkers “using loose guidelines” and said the council would not “support legislation that is arbitrary and ambiguous.”

The mayor’s office shot back with its correspondence with the council, showing that the administration has been responsive. In a letter dated July 29 the Department of Environmental Protection detailed the specifics of how the city would keep down music, construction, and motorcycle noise. Although Mr. Miller is claiming the mayor’s proposal is “ambiguous,” the letter spoke of specifics, including decibels and distance.