New Jersey cops ordered East Rutherford residents to shut down their air conditioners and shelter in place Thursday amid air contamination fears sparked by a fire at a nearby chemical plant.

The blaze broke out at the Diamond Chemical Co. off of Route 17, according to the East Rutherford Fire Department, leading Lyndhurst police to blast out a warning to locals just before 1:50 p.m.

“Chemical fire in East Rutherford. All Residents/Businesses east of Orient Way are to shelter in place and secure HVAC units,” the department wrote in the message. “A chemical plume is being monitored by Bergen County Haz-May [sic] and OEM [the Office of Emergency Management].”

Firefighters contained the blaze, and the Rutherford Police tweeted the all-clear just after 4 p.m.

“Hazmat completed additional checks of the air quality and has determined it is safe to lift the Shelter-In-Place order,” the department wrote. “You can turn your air conditioning back on to enjoy the comfort of your home.”

There were no immediate reports of the injuries in East Rutherford, a town of approximately 10,000 people about 12 miles west of Midtown.

Multiple phone calls to the Diamond Chemical Co. — described on its website as “one of the largest privately owned national cleaning and sanitizing product companies” — went unanswered Thursday.

Additional reporting by Haley Lerner