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NEW YORK — Enforcement of the city’s Key to NYC vaccine requirement for all workers and patrons of New York businesses began Monday.

Mayor Bill de Blasio said civilian inspectors from 13 city agencies will help enforce the law, which requires proof of vaccination at restaurants, clubs and bars, fitness centers, gyms, pools, movie theaters, concert venues, museums and aquariums, sports arenas and more.

See a full list of places in NYC under the vaccine mandate.

“Inspectors will come out, make sure the check-in procedure’s going right with the ID and the vaccination proof, making sure the business has posters up or other notices up,” de Blasio said Thursday.

The inspectors will be from: DCWP, DEP, DOB, DOHMH, DOT, Parks, FDNY, HPD, OSE, SCOUT, Sheriff’s Office, TLC and DSNY.

People ages 12 and up will be required to show proof of vaccination for entrance at many New York City locations.

“We’re going to make sure everyone’s safe, that’s the key because it’s what will give people confidence,” de Blasio said. “It’ll give them confidence in each business they go to, confidence in the comeback of New York City. It’s going to help us overcome COVID once and for all.”

Monday, restaurant employees and diners said they had no issue with the mandate.

“We wanted to be safe,” one restaurant manager said. “Our staff, our guests — that’s why we just follow all the instructions by the government.”

A tourist from Arizona said they felt similarly.

“I was totally fine with it,” Branch McNeal said. “I think we gotta do whatever we can to stem the tide of the pandemic issue, for sure.”

Sure, many others voiced frustration with the enforcement, saying it infringes on their rights.