MOUNT EDEN - Stores along a section of East 170th Street in Mount Eden had to close down after high carbon monoxide (CO) levels were detected.
Firefighters forced the stores to close and evacuated those inside those stores until the gas dissipated three hours later.
Officials deemed that a malfunctioning generator in a store's basement was the cause of the CO gas.
Many stores keep their doors open after the firefighters declared it safe just to be extra sure.
No injuries were reported because of the CO gas.
CO poisoning symptoms include headache, nausea, dizziness and shortness of breath. Officials advise anyone who thinks they are suffering from CO poisoning to get outside or seek medical attention immediately.