N.J. Stat. § 40:81-21: Emergency ordinances

No ordinance passed by the municipal council shall go into effect before ten days from the time of its final passage, except when otherwise required by the general laws of the state or by the provisions of this subtitle, but an ordinance for the immediate preservation of the public order, peace, health or safety, or to remedy an emergency caused by fire, flood, explosion, storm, epidemic, recovery of judgment, the act of God or the public enemy, may be passed to take effect immediately without publication and at one meeting, by the vote of one more than a majority of the members of the municipal council.