There’ll be no mystery meat, or any other meat, on Mondays at New York City public schools.

New York City public schools are expanding their “Meatless Mondays” program in the fall.

“Cutting back on meat a little will improve New Yorkers' health and reduce greenhouse gas emissions,” said Mayor Bill de Blasio in a statement Monday.

“We're expanding Meatless Mondays to all public schools to keep our lunch and planet green for generations to come.”

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The initiative will provide the system’s one million students with all-vegetarian breakfast and lunch menus every Monday.

Advocates note Meatless Mondays promote healthy, environmentally friendly meal options.

“The announcement that Mayor de Blasio has expanded Meatless Monday to all New York City public schools marks a major milestone. Through this united effort, New York City’s schools take a leadership role in getting our children on a healthier track, as well as making a positive impact on our environment,” said Sid Lerner, who is the founder of the Meatless Monday Movement, in a statement.

A pilot program was started in 15 Brooklyn schools in the spring of 2018.

The city said the expansion will be cost-neutral.

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School nutrition experts will get students’ feedback before the menus are finalized.

In January, New York City started promoting “Meatless Mondays” options at its 11 public health system hospitals. The program also encourages patients to continue the practice after their discharge.

The Associated Press contributed to this report.