The city will deploy inspectors to enforce the vaccine mandate for restaurants, bars, gyms, and other indoor venues starting Monday, Sept. 13.

Municipal workers will check on the businesses to make sure they require workers and patrons aged 12 or older to have at least their first dose of the COVID-19 vaccine.

Key to New York City

Mayor Bill de Blasio announced the new regime last month, when the policy known as Key to NYC first went into effect on Aug. 17, giving businesses almost four weeks to prepare for the requirements.

“This is going to reach hundreds of thousands of people and convince them it’s time,” de Blasio said at the time. “We know this is going to work because New Yorkers love our arts, our culture, entertainment, restaurants — they’re part of who we are.”

The mandate covers eateries, indoor fitness, and entertainment venues like movie theaters, museums, and concert halls, and de Blasio hopes the measures will boost inoculations among younger New Yorkers, who still lag well behind older residents for vaccination rates.

“I am absolutely certain this is going to motivate a lot of people to get vaccinated, particularly young people,” he said in August. “We know one of the biggest areas of concern is reaching younger New Yorkers.”