Three people suffered serious to critical carbon monoxide poisoning in their Taylorsville home after a car was left running for hours in their garage Friday.

A couple in their mid-70s live in the house on the 700 West block of 4800 South with their 26-year-old granddaughter, said Unified Fire Authority Capt. Clint Mecham.

About 4:30 p.m., the grandmother called her son and daughter-in-law, saying she felt sick, was falling down and didn't know what was wrong, Mecham said. The son and daughter-and-law arrived, finding a strong exhaust smell in the house. They helped the woman, her husband and the granddaughter out and called 911.

Paramedics found the granddaughter, who lives in an apartment above the garage, unresponsive. She taken to Intermountain Medical Center in critical condition. The man was in serious condition and the grandmother suffered minor injuries.

Investigators found the car running in the garage. They determined it had been on since it was used for an errand by the grandparents about 8 a.m., Mecham said. The exhaust fumes leaked into the house and into the granddaughter's apartment above the garage.

Lindsay Whitehurst